THE NEW ZEALAND 
JOURNAL OF SC _NC'E 
AND ■ 
TECHNOLOGY 
CONTENTS. 
ARTICLES: 
Page 
Former Times 
G. L. ADKIN. Mangahao Hydro=electric Scheme : The Structure of Man^ahan 
No. 1 Gorge s and its Bearing on the Construction of 
, J 
E. BEST. Note on a Peculiar Dagger=like Weapoi 
ASTRONOMICAL NOTES’:— 
A. C. GIFFORD. The Initial Radiation from a Nova .. 6 
A. C. GIFFORD. The Great Velocities of the Planetary Nebulae .. .. 9 
DEPARTMENTAL REPORTS:— 
H F. SKEY. Mean Hourly Values of the Magnetic Declination and the 
Horizontal Magnetic Force.. .. .. .. . .. 13 
J. HENDERSON. Reefton Coalfield , .. .. .. .. 18 
J. HENDERSON. Notes to accompany a Geological Map of the Cheviot 
District .. .. . v .. .. .. .... 24 
THE NEW ZEALAND INSTITUTE SCIENCE CONGRESS 
31 
REVIEWS AND ABSTRACTS 
Report of the Food Investigation Board, 1919-20. Cretaceous Fossils of 
New Zealand. Die Geologie von Neuseeland. A New Theory of 
Polynesian Origins. A Maori Food - bowl. Some Unrecorded Maori 
Decorative Work .. .. .. .. .. .. .. 45 
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CORRESPONDENCE.—All communications relative to the Journal should be 
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