XVIII T. H. Goodspeed 



lowed, questions were raised concerning the factors which had 

 brought about the distribution of certain marine algae, and in 

 particular, the possible importance of the temperature factor 

 was discussed. Here, then, was the origin of a point of view 

 which Setchell has effectively developed. Indeed, one of his most 

 significant research contributions has had to do with the estab- 

 lishment of critical temperature intervals in relation to the dis- 

 tribution of the algae and, more recently, of other aquatic plants 

 and of terrestrial plants. With respect to the algae, for example, 

 he has shown that an interval of 5° C. in amplitude determines 

 the zone of distribution of a species, and the seasonal invasion 

 of these zones by members of other zones. 



Five years later. Professor Setchell was called to the Univer- 

 sity of California to become Professor of Botany and Chairman 

 of the Department, an appointment which he held continuously 

 until his retirement as Professor Emeritus in 1934. He was one 

 of those younger men whom Benjamin Ide Wheeler brought to 

 Berkeley to assist him in the building of the greater university— 

 an institution which will never cease to reflect the foresight and 

 wisdom of one who was perhaps the greatest of the older school 

 of American university presidents. Among Professor Setchell's 

 older associates on the faculty were Joseph LeConte, Hilgard, 

 Rising, and Hesse, and among the younger, Ritter, Leuschner, 

 Louderback, and Blasdale. Under E. L. Greene, his predecessor, 

 the Department of Botany included Marshall A. Howe as an 

 instructor, and as assistants W L. Jepson, Ivar Tidestrom, and 

 J. Burtt Davy. Later, W. J. V. Osterhout and H. M. Hall became 

 members of the staff. For many years, by virtue of his position 

 as head of the Department of Botany, Professor Setchell acted 

 as Botanist of the California Agricultural Experiment Station. 

 In 1898, there was erected a small building provided with labora- 



