THE NEW ZEALAND BOARD OF SCIENCE AND ART. 
THE 
NEW ZEALAND 
JOURNAL OF SCIENCE 
AND 
TECHNOLOGY. 
VOLUME III. 
Edited by 
Dr. 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 Minister of Internal Affairs. 
WELLINGTON, N.Z. 
By Authority : Marcus F. Marks Government Printer. 
1921. 
