lOO CARNEGIE INSTITUTION OF WASHINGTON. 



Dr. B. E. Livingston, of the University of Chicago, under a grant 

 from the Carnegie Institution, spent July to September, 1904, at the 

 laboratory, engaged in investigating various desert plants with ref- 

 erence to their power to abstract moisture from arid soils. The 

 results of his work have not yet been formulated. 



Prof. F. E. Lloyd, of Columbia University, was occupied at the 

 laboratory from June to August, 1904, under a grant from the Bo- 

 tanical Societ}^ of America, in studying the comparative anatomy of 

 desert plants and the relation of their stomatal action to transpiration. 

 The results are to be incorporated in a paper now in preparation. 



Following is a list of titles of papers descriptive of investigations 

 carried on in connection with the Desert Botanical Laboratory dur- 

 ing the past year : 



Cannon, W. A. Observations on the germination of Phoradendron villosutn 



and P. californicmn. Bull. Torr. Bot. Club, 31 : 435-443. 6 figs. 1904. 

 MacDougal, D. T. Botanical explorations in the southwest. Jour. N. Y. Bot. 



Gard., 5 : 89-91. i pi., 5 figs. 1904. 

 MacDougai., D. T. Delta and desert vegetation. Bot. Gaz., 38 : 44-63. 7 figs. 



1904. 

 Spalding, V. M. Biological relations of certain desert shrubs. The creosote 



bush (Covillea tyidrntata) and its relation to the water supply. Bot. Gaz., 



38: 122-138. 7 figs. 1904. 

 Spalding, Effik SouthworTh. Mechanical adjustment of the saguaro 



[Ceretis i^iganteus^ to varying quantities of water. To be printed in the 



Bulletin of the Torrey Botanical Club. 



Several applications for the privileges of the laboratory during 

 the coming year have been received. 



A small storage building has been erected near the laboratory. 

 Electric fittings have been put into place, and necessary additions 

 have been made to the apparatus and equipment. 



Burton E. Livingston, University of Chicago, Chicago, 111. Grant 

 No. 156. For investigations of the relations of desert pla7its to soil 

 ?noisture a7td to evaporatio7i . $400. 



Dr: Livingston's investigations were carried on at the Carnegie 

 Institution Desert Botanical Laboratory at Tucson, Arizona. The 

 work has been carried on by quantitative measurements of several 

 phenomena, the data of which have not yet been brought to a con- 

 dition to warrant more than a general statement. The months of 

 July, August, and part of September were spent at the Desert Botan- 

 ical Laboratory in making these measurements. The latter part of 

 September was spent in a town in the dry region lying still farther 

 west, and studies were made at several points in California. 



