Folger was an avid collector of Shakespeareana, assembling the world's largest collection of
First Folio editions of Shakespeare's plays. The first rare book Folger acquired was a 1685 copy of the
Fourth Folio, purchased in 1889 for $107.50. He purchased his first original copy of the First Folio four years later, in 1893. Unlike other wealthy collectors of the period, like
Henry E. Huntington and
J.P. Morgan, Folger favored "imperfect" copies of rare volumes, with their
marginalia and other markings. Following this trend, his Folio collection was marked with diversity in provenance and condition. He preferred to purchase Early Editions of books published between 1567 and 1606, in addition to manuscripts of the period. Based on their collective knowledge of Latin and French, and Emily's proficiency in German, the couple also favored rare volumes published on the Continent in the sixteenth and seventeenth centuries. The couple was less interested in art collection, and many of the Shakespeare-related paintings they purchased were misattributed to artists like
Thomas Gainsborough. The Folgers chose items to purchase from booksellers' catalogues, which were initially perused and marked up by Emily, before she passed them on to Henry, who kept an extensive and precise list of items he intended to bid on. If possible, he inspected an item personally before purchasing it. He also avoided consulting scholarly experts about rare volumes, preferring his own and Emily's expertise, as she received an M.A. from
Vassar College in 1896 for a thesis on Shakespeare. Folger used professional booksellers as middlemen at auctions, believing that the concealment of his identity would keep prices low. Due to the growing size of the collection and their concern for fireproofing, eventually few of the Folgers' acquisitions were stored in their living space. They kept an extensive card catalog at home in Brooklyn, and when traveling, took a smaller, annotated set of check lists along with them. The collection itself was stored among several fireproof warehouse companies throughout Manhattan, in specially designed wooden cases originally meant to hold two five-gallon cans of oil each. Frederick Fales, a co-worker of Folger's at Standard Oil, initially designed and ordered these air-tight wooden cases for company use. Some of the most valuable items were kept in bank vaults, or in a safe in Folger's office. Folger financed a half-century of collecting with his Standard Oil salary and extensive investments in the company. His high placement at Standard Oil also allowed him to take out loans with his friend Charles Millard Pratt,
John D. Rockefeller, and even his wife, to fund his purchases. He generally paid for items in cash, a strategy that earned him the favor of many booksellers who needed immediate funds. Folger also preferred to purchase whole collections, like the
Halliwell-Phillipps collection, acquired in 1908, because bulk purchases drove down prices of individual items. In 1909, Folger established a Shakespeare Prize at Amherst; winning students won a cash prize, and their essays joined Folger's collection and later the Folger Shakespeare Library. Folger also made donations to Amherst College's library, contributing many duplicate volumes purchased at auction to the College. The most valuable of these donations were two leaves from a
Gutenberg Bible. ==Folger Shakespeare Library==