NOTES AND COMMENT 



Blakeslee and Jarvis have extended their bulletin on Trees in Winter 

 into a sumptuous book of 450 pages, bearing the same title (The Mac- 

 millan Company, 1913). The first half of the volume treats of the prop- 

 agation, planting, pruning and care of trees, of the methods for con- 

 trolling bacterial deca}' and insect ravages, and of the proper use of trees 

 in securing landscape effects. The second half contains the illustrations 

 and keys for determination of trees in -R-inter condition. Although the 

 title obscures the most w-idely useful half of the book, we hope that this 

 half will be discovered hy the public and that use will be made of it 

 for the conservation of our shade and ornamental trees. 



We are requested to call attention to the fact that the students and 

 friends of Professor Dr. Engler, of Berlin, wish to conamemorate his 

 seventieth birthday, on March 25, 1914, by the erection of a marble 

 bust, toward which contributions are solicited. These may be sent 

 either to the Deutsche Bank, Chausseestrasse 17, Berlin, or to Professor 

 Dr. L. Wittmack, Platz von dem neuen Tor 1, Berlin, with designation 

 of their purpose. It may interest friends of Professor Engler in this 

 country to know that he is expecting to join the party of European 

 plant geographers who will \'isit the United States during the coming 

 summer. 



Professor F. E. Clements, of the University of Minnesota, announces 

 a summer Graduate School of Ecology-, to be in session during July and 

 August at ^Minnehaha, on Pike's Peak, in the midst of a region of great 

 vegetational diversity and interest. Professor Clements will be as- 

 sisted bj' Professor Ra^-mond J. Pool, Dr. Edith Clements, and Dr. 

 H. L. Shantz. Several fields of investigation are offered in the quanti- 

 tative study of plant formations and in indi\idual response to habitat. 



Among the articles which will appear in early forthcoming numbers 

 of The Plant World may be mentioned : Osmotic Pressure and Related 

 Forces as En\'ironmental Factors, by Burton E. Li^-ingston; The Vege- 

 tation of Cold Spring Harbor, Long Island, by E. X. Transeau; A Chart 

 of Physiological Processes, by William E. Lawence; and Forest Dis- 

 tribution in the San Juan Islands, bj' George B. Rigg. 



164 



