IV 
Contents 
No. 4, April, 1920 
[Issued August 6, 1920.] 
Page. 
McGregor, Richard C. Some features of the Philippine ornis with 
notes on the vegetation in relation to the avifauna 361 
Thirty-five plates. 
No. 6, May, 1920 
[Issued September 18, 1920.] 
Heise, George W., and Clemente, Amando. Corrosion of iron in 
sulphuric acid. Effect of chromium compounds 439 
One text figure. 
Merrill, Elmer D. On the identity of Aegiphila viburnifolia Jussieu 449 
One plate. 
Espino, Rafael B. Some aspects of the salt requirements of young 
rice plants - 455 
One plate and nine text figures. 
Reinking, 0. A. Higher Basidiomycetes from the Philippines and 
their hosts. III .• 527 
No. 6, June, 1920 
[Issued October 15, 1920.] 
Merrill, Elmer D. Notes on Philippine Euphorbiaceae, III 539 
Quisumbing, Francisco A. Determination of glucose and starch by 
the alkaline potassium permanganate method 581 
Six text figures. 
Trelease, Sam F. The growth of rice as related to proportions of 
fertilizer salts added to soil cultures 603 
Five text figures. 
Cockerell, T. D. A. Supplementary notes on the social bees of 
the Philippine Islands 631 
Haughwout, Frank G.; Domingo, Elias; and De Leon, Walfrido. 
Protozoologic 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.. 633 
Reviews 647 
Errata 649 
Index 651 
