iv Contents 
No. 4, April, 1921 
[Issued July 5, 1921.) 
PERKINS, GRANVILLE A. The structure of the electron....................---- 
PERKINS, GRANVILLE A. Absolute units and the relativity principle. 
FisHER, W. S. New Coleoptera from the Philippine Islands. Family 
Buoresticn,- (706 Amr ns a eh err pees 
HAvuGHWOUT, FRANK G.' A case of human coccidiosis detected in the 
Philippine Islands, with remarks on the development and vitality 
of the cysts of Isospora hominis (Rivolta) ...................-----.----------+--- 
Four plates and one text figure. 
No, 5, May, 1921 
{Issued July 14, 1921.] 
VALENCIA, F. V. Mechanical tests of some commercial Philippine 
timbers Hccisdasterccneacecuninaieanilingk bia brves ti ohias se caeves Covcanacs cbeabecaiccspepebouaadeees 
One plate and nineteen text figures. 
McGrecor, RicHARD C. Birds of Antique Gene Panay, Philip- 
pine Islands ............. : : 
Two plates. 
Kierrer, J. J. Chironomides des Philippines et de Formose................ 
Saccarpo, P. A. Fungi Sinensis aliquot a cl. Prof. Otto A. Rein- 
king collecti et communicati 
Karny, H. H. Katydids (Tettigonioidea) of the Philippine Islands, 
collected by C. F. Baker 
No. 6, June, 1921 
[Issued September 15, 1921.] 
WEsT, AuGustus P., and MonTES, Zora. The ee: solubility, 
and oxidation of =e oil 
Three plates. 
MORRISON, HAROLD. Some nondiaspine Coccide from the Malay 
Peninsula, with descriptions of apparently new species 
One plate and thirteen text figures. 
FUNKHOUSER, W. D. New genera and species of Philippine Mem- 
bracidz ie 
One plate. 
RoHwer, S. A. Some Philippine wasps of the family Chrysidide.... 
PESCHET, R. Description d’un Canthydrus (Coleoptera Dytiscide) 
nouveau, des lige Philipihed. 
NANAGAS, JUAN C. Position and size of the kidneys among Filipinos.. 
Three text figures. 
Garcia, ARTURO, and So~LozA, JuAN. Length and position of the 
vermiform appendix in Filipinos. ; 
One text figure. 
SPAETH, FRANK. Philippine and Bornean — of Hoplionota 
(Coleoptera) is 
REVIEWS 
INDEX 
449 
485 
537 
557 
595 
607 
619 
637 
679 
691 
693 
695 
707 
721 
733 
735 
