IV 
Contents 
No. 3, September, 1921 
[Issued December 19, 1921.] 
Page. 
Maxwell, J. Preston. Filariasis in China 257 
Twenty-five plates and four text figures. 
Merrill, Elmer D. A review of the new species of plants proposed 
by N. L. Burman in his Flora Indica 329 
No. 4, October, 1921 
[Issued January 16, 1922.] 
Reinking, 0. A., and Groff, G. W. The Kao Pan seedless Siamese 
pummelo and its culture 389 
Sixteen plates and one text figure. 
Gebien, Hans. Philippine Tenebrionidae, II 439 
Two plates. 
Banks, Charles S. A Philippine nemestrinid (Diptera) 517 
One plate. 
No. 5, November, 1921 
[Issued February 16, 1922.] 
Heller, K. M. New Philippine Coleoptera 523 
Three plates. 
No. 6, December, 1921 
[Issued March 20, 1922.] 
Lantin, Pedro T. Various methods of serum application in bacillary 
dysentery 629 
Six text figures. 
Perkins, Granville A. Unsymmetrical addition to the double bond, 
I: A theory of the reaction mechanism of the direct union 645 
Six text figures. 
Groves, James. Charophyta from Annam and Guam 663 
Rohwer, S. A. The Philippine wasps of the subfamily Sphecinae.... 665 
Merrill, Elmer D. Two new species of plants from Hainan 677 
Cole, Howard Irving. The dissociation of hexaphenylethane from 
the viewpoint of the octet theory of valence 681 
McGregor, Richard C. New or noteworthy Philippine birds, IV.... 691 
Four plates and three text figures. 
Becker, Wilhelm. Die Violen der Philippinen 707 
Okamoto, Kikuo. Secondary sexual characters in the loach Misgur- 
nus anguillicaudatus Cantor 723 
One plate. 
Perkins, Granville A. The structure of chlorine dioxide and relat- 
ed compounds 729 
