79 



known " Guide to the Flora of Washington and Vicinity," in 

 addition to numerous important paleobotanical papers, has, ac- 

 cording to a recent statement in Science, been elected professor 

 of sociology- in Brown University and will begin his new duties 

 in September. 



Dr. D. T. MacDougal, director of the department of botanical 

 research of the Carnegie Institution of Washington, who has been 

 spending the winter at the Desert Botanical Laboratory at Tuc- 

 son, Arizona, came east early in April to attend the Franklin 

 bicentenary in Philadelphia. During June, July, and August, 

 he will be occupied with his mutant-cultures at the New York 

 Botanical Garden. 



The summer session of the Biological Laboratory of the 

 Brooklyn Institute of Arts and Sciences, located at Cold Spring 

 Harbor, Long Island, will begin on July 5 and continue for six 

 weeks. Dr. D. S. Johnson of Johns Hopkins University remains 

 in charge of the instruction in cryptogamic botany and will be 

 assisted by Mr. Harlan H. York, of Columbia University. Dr. 

 E. N. Transeau, of Alma College, Michigan, will give instruction 

 in plant ecology. 



Professor Hugo de Vries, of Amsterdam, arrived in New York 

 on April 10. He gave an address in Philadelphia, April 18, on 

 " Elementary Species in Agriculture " in connection with the 

 celebration of the two hundredth anniversary of the birth of 

 Benjamin Franklin, and on April 21 lectured at the New York 

 Botanical Garden on " The Correlation of Characters in Plants." 

 He will visit various institutions where experiments in plant 

 mutation are being carried on and in June and July will deliver a 

 course of botanical lectures at the summer session of the Univer- 

 sity of California. 



The New York Botanical Garden collecting expedition, headed 

 by Dr. Britton and referred to in the last number of Torreya, 

 returned to New York on April i. Dr. Britton and Dr. Howe, 

 accompanied by Professor William Morton Wheeler of the Amer- 

 ican Museum of Natural History, spent ten days in the early 



