THE BOTANISTS OF PHILADELPHIA. 309 



vania, the waste areas, state forest lands, time and fire as 

 elements in the forestry problem, a table of forest fires, 

 relations of forest to the water supply, table relating to 

 water failure, catalogue of forest trees of Pennsylvania 

 having commercial value, detailed statement of cleared and 

 timber lands by counties, and timber rafted for the last 

 twenty years to Williamsport. Considerable space is given 

 in the report to suggestions as to sections of the State 

 suitable for a forest reserve. In 1894 there were sold in this 

 State 110 less than 1,509,159 acres for taxes, which aggre- 

 gated 290,386.13, an area equal to one-nineteenth of the 

 area of the Commonwealth.* 



As a lecturer, as connected with the Michaux Lecture 

 Fund of the American Philosophical Society and with the 

 Forestry Association of Pennsylvania, Dr. Rothrock had 

 a pleasing way of reinforcing his remarks by stereopticon 

 views of trees, landscapes and historical places of his own 

 making. His lectures have always been well attended. 

 It should be said of Dr. Rothrock, that in abandoning 

 the field of scientific botany to popularize the forestry cause 

 in Pennsylvania, he did it reluctantly and only on the 

 most absolute conviction of duty, and with the full knowl- 

 edge that in so doing he was jeopardizing his standing as a 

 botanist. He is a member of the American Philosophical 

 Society and the Philadelphia Academy of Natural Sciences. 



A genus of Asclepiadacese, from lower California, com- 

 memorates Dr. Rothrock 's services to botany. f His writings 

 are : 



* Philadelphia Ledger, October 26, 1896. 



t Proceedings American Academy, XX : (1885) 295. (Rothrockia cordifoliu I. 

 Also in Wheeler's Survey Report Pyrrhopappus Rothrockii, Gray ; Halenia Roth- 

 rockii, Gray; Stachys Rothrockii, Gray : Towendsia Rothrockii, Gray; Artemisia 

 Rothrockii, Gray ; Xama Rothrocki, Gray. 



