Registered, at G.P.O., Wellington, as a Magazine. 
’•&a 
■ ' 
THE NEW ZEALAND BOARD OF SCIENCE AND ART. 
. * v 
•s 
VUL 1 • fg THE 
,r,.-\K\v ZEALAND 
JOURNAL OF SCIENCE 
AND 
TECHNOLOGY. 
Edited by 
Dr. J. ALLAN THOMSON ; 
Assisted by 
Dr. C. A. COTTON, Mr. S. H. JENKINSON, and Professor E. MARSDEN, 
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. 2. 
April, 1920 . 
WELLINGTON, N.Z. 
By Authority: Marcus F. Marks, Government Printer, 
1920. 
ANNUAL SUBSCRIPTION, 6s. 
SINGLE COPY, Is. 6d. 
CONTENTS ON PACE 4 OF COVER* 
