CONTENTS 
Page. 
PERKINS, GRANVILLE A. The structure of the 
electron 325 
PERKINS, GRANVILLE A. Absolute units and the re- 
lativity principle 341 
. FISHER, W. S. New Coleoptera from the Philippine Is- 
lands. Family Buprestidse, tribe Agrilini 349 
H AUGH W OUT, FRANK G. A case of human coccidio- 
sis detected in the Philippine Islands, with remarks 
on the development and vitality of the cysts of 
Isospora hominis (Rivolta) 449 
& 
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