Vy„/ 
' 
Registered at G.P.O., Wellington, as a Magazine. 
THE NEW ZEALAND BOARD OF SCIENCE AND ART. 
'tin 
an 
THE 
NEW ZEALAND 
JOURNAL OF SCIENCE 
AND 
TECHNOLOGY. 
Edited by 
Dr. J. ALLAN THOMSON ; 
Assisted by 
Professor C. A. COTTON, Mr. S. H. JENKINSON, and 
Professor E. MARSDEN, Wellington, 
Professor A. P. W. THOMAS, Auckland, 
Professors C. CHILTON and R. J. SQpTT, Christchurch, 
and 
Professor W. B. BENHAM, Dunedin. 
Issued under the authority of the Hon. W. DOWN IE STEWART, 
Minister of Internal Affairs. 
VOL.. IV.—No. 3. 
June, 1921. 
WELLINGTON, N.Z. 
By Authority : Marcus F. Marks, Government Printer. 
1921-. 
ANNUAL SUBSCRIPTION, 6s. SINGLE COPY, Is: 6d. 
CONTENTS ON PAGE 4 OF COVEIR. 
