PACIFIC SCIENCE 
A QUARTERLY DEVOTED TO THE BIOLOGICAL 
AND PHYSICAL SCIENCES OF THE PACIFIC REGION 
VOL. Ill APRIL, 1949 No. 2 
Previous issue published January 3, 1949 
CONTENTS 
PAGE 
Populations of Birds on Midway and the Man-Made Factors Affecting Them. 
Harvey I. Fisher 103 
Paratylenchus minutus, n.sp., a Nematode Parasitic on Roots. Maurice B. 
Linford, Juliette M. Oliveira, and Mamoru Ishii Ill 
The Origin and Composition of Pyrolusite Concretions in Hawaiian Soils. 
G. Donald Sherman, Annie K. S. Tom, and Charles K. Fujimoto 120 
New Sponges from the Yap Archipelago. M. W. de Laubenfels .... 124 
Observations on the Haemoproteus of Pigeons in Honolulu, Hawaii. L. Kart- 
man 127 
A Revision of the Genus Alstonia ( Apocynaceae ) . Joseph Monachino . . 133 
NOTES: 
Research Openings in Micronesia 183 
Prevention of Deterioration Abstracts 183 
News Notes 184 
Pacific Science, a quarterly publication of the University of Hawaii, appears in January, 
April, July, and October. Subscription price is three dollars a year; single copies are one 
dollar. Check or money order payable to University of Hawaii should be sent to Pacific 
Science, Office of Publications, University of Hawaii, Honolulu 14, Hawaii. Reprints 
of articles from Volumes I and II are available to subscribers. 
