av WYItUUIitvsd 
No. 4, April, 1920 
[Issued August 5, 1920.] 
McGrecor, RICHARD C. Some features of the Philippine ornis with 
notes on the vegetation in relation to the avifauna 
Thirty-five plates. 
No. 5, May, 1920 
[Issued September 18, 1920.] 
HEISE, GEORGE W., and CLEMENTE, AMANDO. Corrosion of iron in 
sulphuric acid. Effect of chromium compounds. 
One text figure. 
MERRILL, ELMER D. On the identity of Aegiphila viburnifolia Jussieu 
One plate. 
ESPINO, RAFAEL B. Some aspects of the salt requirements of young 
rice plants 
One plate and nine ae figures. 
REINKING, O. A. Higher Basidiomycetes from the Philippines and 
their hosts, ITI....... 
No. 6, June, 1920 
[Issued October 15, 1920.] 
MERRILL, ELMER D. Notes on Philippine Euphorbiaceae, IIT 
QUISUMBING, FRANCISCO A. Determination of glucose and starch by 
the alkaline potassium permanganate method 
Six text figures. 
TRELEASE, SAM F. The growth of rice as related to proportions of 
fertilizer salts added to soil cultures 
Five text figures. — 
CocKERELL, T. D. A. Supplementary notes on the social bees of 
the Philippine islands 
HAUGHWOUT, FRANK G.; DOMINGO, ELIAS; and DE LEON, WALFRIDO. 
Protozodlogic and clinical studies on the treatment of protozoal 
dysentery with benzyl benzoate. II. Treatment of a case of 
acute balantidiosis; recovery; death from other causes; failure 
to find the parasites in the bowel lumen and gut wall at autopsy.. 
REVIEWS 
ERRATA 
INDEX 
Page. 
361 
439 
449 
455 
527 
539 
581 
603 
631 
633 
647 
649 
651 
