136 



above West Chester Pike, Delaware County, June 2, 1912, B. 

 Long yoQ4; Wawa, Delaware County, May 23, 1909, F. W. 

 Pennell 2072; Frazer, Chester County, June 21, 1909, B. Long 

 g8o; Lancaster, Lancaster County, June 22, 1909, B. Long 1033, 



1034- 



Specimens of all these collections are in the Herbarium of the 

 Philadelphia Botanical Club, with the exception of that from 

 Milford, New Jersey, which, together with some of my own 

 numbers, is in the herbarium of K. K. Mackenzie. A specimen 

 of the Wawa collection is also to be found at the New York 

 Botanical Garden. All the material cited has been critically 

 examined by Mr. Mackenzie. 



Academy of Natural Sciences of Philadelphia 



IS FORESTRY A SCIENCE? 



By Roland M. Harper 



In an interesting paper entitled "Darwinism in forestry," in 

 the American Naturalist for September, 1913, Raphael Zon 

 discusses a few contributions to pure science that have been made 

 by foresters, and makes this statement: " Forestry as a science is 

 nothing else hut the study of the laws which govern the struggle for 

 existence^ Prof. Henry S. Graves, in an address made before 

 the Washington Academy of Sciences on Dec. 3, 1914,* 

 on "The place of forestry among natural sciences," expresses 

 some of the same views as Zon, and also goes considerably 

 farther in describing the contributions of foresters to sci- 

 ence. He points out, as Zon did, that forests are the highest 

 expression of plant life, and states that forestry is tree sociology, 

 or the science of tree societies. He acknowledges the debt of 

 foresters to taxonomists, physicists, chemists, geologists, soil 

 investigators, pathologists, entomologists, etc., but mentions that 

 Darwin's theory of evolution was anticipated by a writer on 

 forestry, and that Warming, Schimper, and other pioneer 



* Printed in Journ. Wash. Acad. Sci. 5: 41-56. Jan. 19, 1915; Science II. 41: 

 117-127. Jan. 22, 191S; Monthly Weather Rev. 42: 671-672. Mar. 16, 1915 

 (abstract); and in Smithsonian Report for 1914. (in ed.) 



