NOTES AND COMMENT 



The tenth anniversary of the establishment of the Desert Laboratory 

 was celebrated at Tucson, Arizona, on September 20. During the day 

 demonstrations of researches in progress were made to visitors, includ- 

 ing members of the International Phytogeographic Excursion, as fol- 

 lows: 



10.30 A.M. Suite of Plants in Series of Environic Reactions. By Dr. D. T. Mac- 

 Dougal. 



10.45 A.M. Prof. W. L. Tower's Experiments on the Influence of Environic Fac- 

 tors in the Evolution of the Chrysomelid Beetles. By Mr. J. G. 

 Sinclair. 



11.00 A.M. Researches on Water Relations of Plants. By Prof. B. E. Livingston, 



assisted by Mr. Pulling and Mr. Shive. 

 12.00 A.M. Certain Features of Correlation Between Climate and Vegetation in 



the Tucson Region. By Dr. Forrest Shreve. 

 12.30 A.M. Experimental Studies in the Root-Habits of Desert Species. By Dr. 



W. A. Cannon. 



2.00 P.M. Calorimetric Method of Determination of Leaf-Temperatures. By 

 Mrs. Edith B. Shreve. 



2.15 P.M. Comparative Light Measurements and the Chemical Effects of Radiant 

 Energy in Plant Processes. By Dr. H. A. Spoehr. 



2.45 P.M. Exhibition of Progenies of Young Plants Affected by Ovarial Treat- 

 ments. By Dr. D. T. MacDougal. 



3.00 P.M. Water Balance of Desert Plants. By Dr. D. T. MacDougal. 



3.15 P.M. Ascent of Tumamoc Hill: or Drive to Cactus Garden of the University 

 of Arizona. 

 Exhibition of Publications. 



In the evening forty scientists were the guests of the Carnegie Insti- 

 tution of Washington at dinner. Brief addresses were made by Ge- 

 heimrat Professor Engler, Director of the Royal Botanical Garden of 

 Berlin; Professor R. H. Forbes, Director of the Arizona Experiment 

 Station; Professor B. E. Livingston, Director of the Laboratory for 

 Plant Physiologj' of Johns Hopkins University, and Dr. Eduard Riibel 

 of Zurich. Congratulatory telegrams from President Woodward, Pro- 

 fessor V. M. and Mrs. E. S. Spalding, and others were read. The mem- 

 bers of the International Phytogeographic Excursion also presented tes- 



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