SCIENCE-ADVERTISEMENTS 



Publications of 

 The Philippine Bureau of Science 



Vegetation of Philippine Mountains. The rela- 

 tion between the environment and physical 

 types at different altitudes. By William H. 

 Brown. 434 pages, 41 plates, and 30 text 

 figures; postpaid $2.50, U. S. currency. 



Index to the Genera of Birds. By Richard (j 

 McGregor. 185 pages; postpaid $1.00, U. S. 

 currency. 



Species Blancoanae. A critical revision of the 

 Philippine species of plants described by 

 Blanco and by Llanos. By E. D. Merrill. 424 

 pages; postpaid $2.25, U. S. currency. 



Philippine Water Supplies. By G. W. Heise and 

 A. S. Behrman. 218 pages, 19 plates; post- 

 paid $1.75, U. S. currency. 



An Interpretation of Rumphlus's Herbarium 

 Amboinense. By E. D. Merrill. 596 pages, 2 

 maps; postpaid $3.00, U. S. currency. 



The Philippine Journal of Science, a monthly 

 (no longer issued in sections), per year $5.00, 

 U. S. currency. 

 A list of the publications of the Philippine 



Bureau of Science and a sample copy of the 



Philippine Journal of Science will be sent upon 



request. 



Subscriptions and orders for publications 

 should be sent to 



THE BUSINESS MANAGER 



Philippine Journal of .^cience 

 ' Bureau of Science MANILA, P. I. 



The Boreal Flora 



of the 



Sierra Nevada of California 



By FRANK JASON SMILEY 



423 pages, 7 plates. Paper, $5.00. Carriaoe 

 extra, weight 2% lbs. 



This book constitutes a working flora 

 of the high Sierra Nevada of California. 

 It has been the intent of the author to 

 present a list of all the plants of the 

 high Sierra with keys for their determi- 

 nation. He has also included descrip- 

 tions of the geology, topography, and 

 climate of the range. 



University of California Press 



Berkeley, California 



OiirRbeos ta ts for Every Circuit 



''Becbro" 



Sliding Contact 



Rheostats 



Tubular and Stone 



Types. Also 



Carbon Compression 



Type 



Almost all Colleges and 

 Universities, and Technical 

 Schools, also many Indus- 

 trial Concerns are using 

 our Rheostats with entire 

 satisfaction. 



Send For Our Bulletin 



C-10 



issued September, 1921, 

 shows many types and de- 

 signs of rheostats made by 



BECK BROS. 



3640-42 N. Second St. 

 PHILADELPHIA, PA. 



