j6 REPORTS ON INVESTIGATIONS AND PROJECTS. 



Institute; Professor Johnson's morphological and physiological studies of 

 the fruits of the cacti have taken him to the Desert Laboratory, the Marine 

 Laboratory at South Harpswell, Maine, and also to his own laboratory in 

 Johns Hopkins University; Professor Livingston's researches on soil-mois- 

 ture have been at the Desert Laboratory and in the laboratories for plant 

 physiology of Johns Hopkins University. The study of the Cactaceas by 

 Drs. Britton and Rose has been carried out in quarters furnished by the 

 Smithsonian Institution, and the facilities of the New York Botanical Gar- 

 den have been placed at the disposal of the Research Associates in charge of 

 this investigation. Dr. Rose has also visited the principal botanical centers 

 of Europe, in which material has been collected, and perfected arrangements 

 for the comprehensive study of this group of desert plants. 



Dr. Shreve has carried out observations in connection with his geo- 

 graphical studies at the montane plantations in northern Arizona, Utah, 

 Nevada, and California, and Mr. G. Sykes has worked in the map collections 

 of the British Museum, the library of the Royal Geographical Society, and 

 the Bancroft collection in the University of California, and accompanied the 

 Director as stated below. Dr. H. A. Spoehr has used the facilities of the 

 chemical department of the University of Chicago and consulted the John 

 Crerar Library of Chicago. Dr. D. T. MacDougal has spent some time at 

 each of the laboratories of the Department; carried out field work in the 

 Cahuila Basin around and on the Salton Lake, carried a line of observations 

 across the Mohave Desert and the Tulare Valley, and early in the year, in 

 company with Mr. G. Sykes, made a traverse of the Red Sea province of 

 Sudan, which was extended south to Khartum, and later a caravan trip of 

 600 miles through the Libyan Desert. Other work not especially mentioned 

 has been prosecuted at the laboratories of the Department. Visits were 

 made to nearly all places in which cooperative work was carried on, and 

 numerous lectures were given by the Director and members of the staff at 

 various places from Stanford University to London and Hamburg, 



