THE NEW ZEALAND 
RNAL OF SCIENCE 
AND 
TECHNOLOGY. 
CONTENTS. ■ 
ARTICLES 
C. A. COTTON. For how long will Wellington escape Destruction by 
Earthquake? ... .. . ^ .. .. 
C. COLERIDGE FARR. Relativity ... 
E. BEST. Huru, or Ngahuru Notes on a Widespread Word denoting Ten, 
and its many Variant Forms in Use throughout the Pacific and Indian 
Ocean Regions .. .. .. .. 
E. MARSDEN and E. W. J. FENTON. The Relative Efficiency of Coal, 
Gas, and Electricity for Domestic Purposes 
R. J. TILLYARD. Neuropteroid Insects of the Hot Springs Region, New 
Zealand, in Relation to the Problem of Trout=food , . .. .. 
I. R. ROBINSON. Cable Spans with Suspension Insulators .. .. 
A. C. CALDWELL and E. MARSDEN. Inductive Interference of Power 
Circuits with Communication Circuits 
E. BEST. Stone=shanked Maori Fish-hooks .. .. 
DEPARTMENTAL REPORT 
P. G. MORGAN. Tangarakau Coalfield, North Taranaki 
229 
232 
248 
257 
271 
280 
286 
295 
297 
NATURAL HISTORY NOTES 
A New Species of Drosophilid Fly. The Occurrence of Cylichnella arachis 
(Q. & G.) in New Zealand Waters .. .. .. .. 302 
REVIEWS AND ABSTRACTS 
Report on Australian Opossums in New Zealand. Report on the Mosquito 
Investigation carried out in the North Auckland Peninsula of New Zea= 
land during the Summer of 1918-19, Part I. A Name=Iist of the 
Birds of New Zealand. Avian Taxonomy .. .. .. .. 304 
CORRESPONDENCE:— 
Frogs in New Zealand .. .. .. .. .. .. 308 
INDEX TO VOLUME HI .. .. .'. .. 309 
NOTICES. 
SUBSCRIPTIONS.—The Journal will be issued six times a year. Subscription, payable 
in advance and including postage, 6s. per annum ; single copy, Is. 6d. Subscriptions 
should be forwarded by money=order to the Director, Dominion Museum, Wellington. 
Subscribers are requested to furnish their full names and addresses. 
CORRESPONDENCE. — All communications relative to the Journal should be 
addressed to the Editor, Dominion Museum, Wellington. 
