Registered at G.P.O., Wellington, as a Magazine, 
THE NEW ZEALAND BOARD OF SCIENCE AND ART. 
V <P ' n 
& ' * 7 1920 
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THE 
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NEW ZEALAND 
„ 
JOURNAL OF SCIENCE 
AND 
TECHNOLOGY. 
Edited by 
Dk. J. ALLAN THOMSON ; 
Assisted by 
Dr. C. A. COTTON and Mr. S. H. JENKINSON, Wellington, 
Professor A. P. W. THOMAS, Auckland, 
Professors C. CHILTON and R. J. SCOTT, Christchurch, 
and 
Professor W. B. BENHAM, Dunedin. 
Issued under the authority of the Hon. Sir FRANCIS BELL, 
Minister of Internal Affairs. 
VOL. III.—No 1. 
February, 1920. 
WELLINGTON, N.Z. 
By Authority: Marcus F. Marks, Government Printer. 
1920. 
ANNUAL SUBSCRIPTION, 6s. SINGLE COPY, Is. 6d. 
CONTENTS ON PAGE 4 OF COVER, 
