321 ASA GRAY. 



He accepted, and in 1 842 took up his residence in Cambridge. The 

 second volume of the "Flora" was completed the following year. He 

 was at once favorably received in learned and social circles of Cam- 

 bridge and Boston ; and when delivering a course of lectures at the 

 Lowell Institute, he first became acquainted with Miss Jane Lathrop 

 Loring, daughter of Mr. Charles Greely Loring of Boston, to whom he 

 was married on May 4, 1848. From this time his energies were devoted 

 to building up a botanical establishment at Cambridge, — for what was 

 in existence before 1842 hardly deserves mention, — and to the com- 

 pletion of a " Flora of North America." The number of collectors and 

 explorers had by this time greatly increased ; and the material they had 

 brought together contained so much that was new, that it was plain that 

 the original plan of the " Flora" must be changed, for the two volumes 

 already published had hardly appeared when a revision seemed neces- 

 sary. It was not until many years later, in 1878, that the first part of 

 the new " Flora" appeared; and he continued to labor toward the com- 

 pletion of his great work until death forced him to relinquish the 

 unfinished task. 



He continued in the exercise of the active duties of lecturer and 

 instructor until 1872, when he was relieved of this charge by the ap- 

 pointment of a colleague, Prof. G. L. Goodale ; but he gave occasional 

 lectures in the College for a few years longer. In 1873 he resigned his 

 office of Director of the Botanic Garden, and Prof. C. S. Sargent was 

 appointed his successor. He retained the title of Fisher Professor and 

 Director of the Herbarium until his death, although he was in part re- 

 lieved of the responsibilities of the latter position by the appointment of 

 Mr. Sereno Watson as Curator of the Herbarium in 1874. 



His long residence and arduous labors at Cambridge were varied and 

 relieved by several journeys, some of which were of considerable extent, 

 and all of which were made to contribute to the advancement of work 

 on the "Flora," either by enabling him to examine in the field the plants 

 which he was studying, or by examination of foreign herbaria, and con- 

 sultations with leading foreign botanists. He made three trips to Cali- 

 fornia, in 1872, in 1877, when he was in company with Sir J. D. 

 Hooker, and in 1885, when he visited not only Southern California and 

 the great Colorado Canon, but journeyed into Mexico as far as Orizaba 

 and Cordoba. He was once in Florida, in 1875, and made, besides, 

 several trips to the mountains of North Carolina, where he botanized at 

 different times with his botanical friends, Sullivant, Carey, Engelmann, 

 Canby, and Redfield. 



He made in all six journeys to Europe, including the journey 



