Correspondence includes that of Boston printer and publisher Ebenezer T. Andrews concerning the purchase of 45 Newbury St. (formerly the Thomas and Andrews bookstore) and other property from 1821 to 1825. Also included are letters from prominent civil engineers William Gibbs McNeill and George W. Whistler, including an 1844 letter from Whistler in St. Petersburg where he supervised the construction of the Moscow-St. Petersburg Railroad; Josiah Quincy, writing in relation to Jackson's work as a commissioner of Boston's waterworks; Caspar W. Wever, who established Weverton Manufacturing Co. in Weverton, Md. using the city of Lowell as a model; and many others requesting advice and financial investment.

A large number of deeds for property in Boston, Waltham, and Lowell are evidence of Jackson's land purchases, including 1822 deeds in Waltham for the land and buildings of the Boston Manufacturing Co. Other papers include receipts, lottery tickets (Jackson was the treasurer of the Harvard College Lottery), deeds for a pew in King's Chapel in Boston and for a tomb-lot in St. Paul's Church in Boston, balance sheets, a $10,000 donation to support an assistant minister at Trinity Church, and papers related to support for Boston's Warren St. Chapel. Also included is genealogical correspondence and a memorial to PTJ I written by the board of the Proprietors of Locks and Canals Corp., for which he served as treasurer.

Rope walk committee records pertain to PTJ I's position as chairman of the Reference Committee which determined a fair price for the City of Boston to purchase the land from its owners, the Proprietors of the Rope Walk Lands. The lands later became part of the Boston Public Garden. Records include Jackson's notes and memoranda, 1824 meeting records, and several letters, including one from Boston mayor Josiah Quincy.

Records in this subseries document the detailed workings of the Lycoming Coal Co. and its failure in 1839. PTJ I was president of this company of Boston investors who bought lands in Farrandsville, Pa. in 1832 to mine for coal. In 1836 the company financed the construction of a blast furnace at Farrandsville, the first in the United States to use coal to produce iron for manufacturing locomotives. The bulk of correspondence is from Lycoming Co. general agent Daniel Tyler to treasurer Charles Russell Lowell (PTJ I's son-in-law), giving detailed progress reports on the company's efforts. Other correspondents include investors Edmund Dwight, Thomas H. Perkins, and George Lyman; British furnace operators Gerard Ralston and Daniel Treadwell; W. P. Farrand; Henry Walters; and James Hepburn. Records also include financial accounts and valuations, investment agreements, deeds, and other legal documents. Undated oversize records include drawings and descriptions of the mines and a survey of the Susquehanna River.

1844 and 1845 papers are related to PTJ I's sale of his farm near Farrandsville, known as "Quay's Farm," to Jonas Sperring.

In 1835 PTJ I purchased, in partnership with William Appleton, Abbott Lawrence, and John P. Thorndike, several large estates on Pemberton Hill. He then graded the hill, using the fill to create land for a terminus for the Boston and Lowell Railroad, later the site of Boston's North Station. On the leveled land, he put up for auction sixty-five lots around a common square, originally named Phillips Place. Records include correspondence related to the purchase of the Greene and Phillips estates (among others); with designers, builders, and purchasers; and with Boston city aldermen about the amount of land to be removed and the sale of existing buildings. Additional records include financial accounts and receipts; purchase and sale agreements; deeds, prospectuses; and a catalog advertising lots for sale with their terms. Also included are accounts for the construction of public ways, court actions related to property disputes, and records related to arbitration between PTJ I and Ebenezer Francis in 1838.

PTJ I became president of this Concord, N.H. railroad in July 1836. Records include by-laws, acts of incorporation, directors meeting minutes from 1835 and 1836, and correspondence with consulting engineers William Gibbs McNeil and George W. Whistler about building the railroad; with project engineer James Baldwin; with treasurer Joseph Low about selling shares to finance it; and with various persons in an effort to obtain funding from the New Hampshire legislature. The project stalled by 1839 for lack of funding.

See also PTJ I's later correspondence with McNeil and Whistler in Personal and business papers, Series II.D.i.

PTJ I's cash book lists daily expenses for food, clothing, rent, charitable donations, and investments, as well as accounts with family members. His various bank books list money deposited and withdrawn. An 1822 account book is labeled "money in pocket and money in bank." PTJ I's 1828 "Memorandum of Manufacturing," written in an almanac, includes several pages of manufacturing statistics for the Waltham and Lowell mills.

Two handwritten copies of this memorial, written on 3 October 1847 by PTJ I's brother, James Jackson, outline his life and character.

PTJ II's business and personal papers include his Harvard admission papers and class lists, employment agreements with James K. Mills as a partner in his commission business in 1840 and 1842, financial accounts and receipts, and an 1857 stock certificate for the New England Emigrant Aid Co. 1857 correspondence includes that with Francis C. Lowell and Gardiner Shaw about investments, trusts, and PTJ II's financial difficulties, and with others about the Hampden Mills and local economic conditions.

Correspondence from 1862 to 1865 is related to the Civil War service of PTJ II's nephew Cabot Jackson Russel, and about obtaining a position for PTJ II's son, PTJ III, as a cavalry officer. Also included are letters from A.S. Hartwell about Hartwell's search for his brother, a prisoner of war. An anonymous letter written in Feb. 1863 describes the living conditions of freed African Americans and "contrabands" in Washington D.C. 1866 papers are related to PTJ II's role on the Harvard Committee of Fifty to fund Alumni Hall in 1866, and as chairman of the class subscription fund, including correspondence, lists, accounts, and receipts.

From 1879 to 1880, many of PTJ II's papers are related to his work as director and treasurer of the Automatic Signal and Telegraph Co. of Boston, including correspondence with company founder, William B. Watkins. 1881 correspondence with Henry Lee and undated sketches of various house floorplans are also included in the papers.

Volumes include a detailed diary of PTJ II's trip during the summer of 1836 to West Point, the Catskill Mountains, Utica, the Erie Canal, and Niagara Falls, and a brief account of his trip in the summer of 1837 to Lowell. An account book, most likely kept by PTJ II's wife, Susan Loring Jackson, lists the names and wages for cooks, nursery workers, chamber maids, and parlor maids with occasional comments on the worker's habits or character. PTJ II's cashbook, ledger, and account books contain entries related to his personal finances as well as family accounts for which he served as trustee. For more information about family trust accounts, see Series III.C.

Other volumes include an account book related to the trust of Mahala Williams, whose relationship to PTJ II is unknown, and a memoranda book containing notes, addresses and costs of materials, most likely used in PTJ II's business as a cotton buyer.

Automatic Signal and Telegraph Co. volumes include a record book containing articles of incorporation, by-laws, minutes of director and stockholder meetings, and treasurer's reports; a book of stock certificate receipts; and a volume listing customer accounts in Boston.

PTJ III's Civil War letters document his service from April 1863 through March 1864 as a 2nd lieutenant with the 1st Mass. Cavalry, and from March 1864 to October 1865 as captain of the 5th Mass. Cavalry, an African American regiment. Writing to his parents and his brother, Charles Loring Jackson, his letters describe daily routines; troop movements; action at the Battle of Aldie in June 1863, where a large part of his regiment was killed; his decision to join the Massachusetts 5th in the spring of 1864; his impression of African American soldiers; his experiences guarding 15,000 Confederate prisoners of war at Point Lookout, Md.; the march into Richmond on 3 Apr. 1865, and his service in Texas from July to October 1865. Included with the letters are typewritten transcriptions. Several notebooks also contain handwritten copies of the letters transcribed by PTJ III's mother, Susan Loring Jackson.

Loose papers include a promissory note, two receipts for Confederate prisoners that PTJ III delivered to Libby Prison, and military orders allowing PTJ III to remain in New Orleans in October 1865. PTJ III's reminiscences of his Civil War service, written in 1895, use his own letters and a regimental history as references and include detailed descriptions of his experiences. A typewritten copy of the memoir contains minor inaccuracies and omits several passages from the original.

Papers are related to the construction of PTJ III's house at 17 Follen St. in Cambridge in 1889. They include mortgage deeds, building contracts, accounts, receipts, work orders, and correspondence.

Papers include ephemera from Dixwell School and Eastern Yacht Club, a letter of admission to Harvard University in 1861, and miscellaneous receipts. Correspondence is largely related to PTJ III's position as treasurer of the Perkins Institution for the Blind; the incapacity of his uncle, Edward Jackson; and various charitable donations. An 1892 letter from Helen Keller discusses the money she raised to build a kindergarten for blind children.

Private cash account books list in detail PTJ III's daily living expenses and income. The P.T. Jackson and Co. account book contains the income and expenses of PTJ III's business as a cotton buyer.

Andrew Cabot (1749-1791) was the father-in-law of PTJ I. In this letter, Cabot's agent writes that he has sold his cargo in Cadiz but seeks advice about returning to America because of current political tensions.

This account book lists prizes taken by the privateer brigantine Oliver Cromwell, captained by William Coles, from the brigantines Queen of Portugal, Little Betsey, and Ville de Bayonne. The privateer was owned in part by John Cabot, Andrew Cabot, and Joseph Lee, in-laws of PTJ I.

This series of financial records, most likely kept by Henry Lee (1782-1867), the brother-in-law of PTJ I, include accounts with the trusts of Charles Jackson, William Cabot, and Hannah Jackson; rental accounts; accounts with various merchants; and a shipping invoice for the brig Hindu.

Mary Turell was the grandmother of Frederick Turell Gray, whose daughter Eleanor Baker Gray married PTJ III. Written in 1821 at the age of 81, Mary's handwritten memoir contains her reminiscences of soldiers marching through Roxbury on their way to Cape Breton in 1745, the Boston Massacre, and the battles of Lexington and Bunker Hill. "Recollections" was published in the New England Historical and Genealogical Register in 1860.

Charles Greely Loring (1794-1867) was the father-in-law of PTJ II. An 1841 letter from Daniel Webster thanks Loring for his support and friendship, and an undated letter asks for contact information for a mutual friend.

Lucy Russel was the cousin of PTJ III and the sister of Cabot Jackson Russel, who died with the Massachusetts 54th Regiment at Fort Wagner. Papers include correspondence related to finding Cabot's sword in Savannah, returning it to the family, and displaying it at the reunion of the Massachusetts 44th Regiment, along with news clippings describing the events.