species. Griscom's Birds of the New York City Region and his works on the faunistics of Massachusetts birds were some of the first books in a new genre: birdfinding guides rather than identification guides. Working from a growing volume of sightings by skilled observers, Griscom provided in these books the details of exactly where a bird could be found in a region (for instance, a specific park or beach), at what time of year (in spring migration, for example), and in what numbers. In preparing these works, Griscom drew in part on his own records. From 1907 until the end of his life, Griscom transcribed his field notes made during trips in the United States and overseas into a set of large ledger books. He recorded identification details of each bird species, estimated numbers of birds, observed behaviors, and made note of weather conditions. The collected sixteen volumes of these ledgers are in the collection of the Peabody Essex Museum. In the field, Griscom is remembered by friends and students for his virtuosity in identification, his enthusiasm and brusque sense of humor, and his great satisfaction in teaching others the pleasures of birding. Probably his most illustrious field trip companion was President Franklin D. Roosevelt, who accompanied Griscom on a trip through Dutchess County, New York, in 1942. Protégés It can be argued that Ludlow Griscom's single most important contribution to ornithology and conservation was his influence on Roger Tory Peterson, leading to the first edition of Peterson's Field Guide to the Birds in 1934. Griscom tested Peterson's paintings for the book's publisher, Houghton Mifflin, demonstrating that the renderings provided the right details that could be used to identify birds in the field. Peterson himself wrote that his field guides were "profoundly influenced" by Griscom's teaching. During his New York years, Griscom became a teacher to a group known as the Bronx County Bird Club, whose members included Peterson, Allan Cruickshank, and Joseph J. Hickey. In his time at Harvard, he was freshman advisor to Chandler Robbins. Ludlow Griscom was also a mentor to Allen Morgan, a fellow director of Massachusetts Audubon Society. Botany A complementary field of interest for Griscom was botany. In the early 1920s, he visited Newfoundland and Quebec on several expeditions, mostly under the direction of Merritt Lyndon Fernald. He had some 40,000 sheets of pressed plants in his own herbarium and the Gray Herbarium at