Beginning with Volume V, a new section, "Section D, Ethnology, Anthropology, and Gen- 

 eral Biology," will be added to the Journal. The price for the whole series to subscribers for 

 igio will be as heretofore, $5 United States currency. Single subscriptions to Section D will 

 be $2 United States currency. 



Beginning with ign, the price of the entire Journal will be increased to $7 United States 

 currency. Section D will appear as often as material is available. 



CONTENTS. 



Page. 



RICHMOND, GEORGE F. Philippine Fibers and 

 Fibrous Substances: Their Suitability for Paper 

 Making 233 



BACON, RAYMOND F. Philippine Terpenes and Es- 

 sential Oils, IV 257 



BACON, RAYMOND F. A Preliminary Study of the 

 Effect of Tropical Sunlight on the Atmosphere, -with 

 Some Notes on Radioactive Phenomena in the Phil- 

 ippines 267 



BACON, RAYMOND F. A Solution of Oxalic Acid and 



Uranium Salts as a Chemical Photometer 281 



REVIEWS 305 



The "Philippine Journal of Science" is issued as follows: 



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 currency per year. 



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 rency per year. 



The entire "Journal," $5 United States currenoy for Volumes II, TTT, IV, and V There- 

 after, $7 United States currenoy per year. 



Authors reoeive 100 copies of their papers free. 



Subscriptions should be sent to the Business If anager, Philippine Journal of Science, 

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FOKEIGN AGENTS. 



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A limited number of unbound copies of previous volumes are 

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 States currency; Supplement to Volume I, $3.50 United States 

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 currency; all later volumes at current subscription prices. 



