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science progress 
A Quarterly Review of Scientific Thought, 
Work and Affairs. 
Editor - COLONEL SIR RONALD ROSS, K.C.B., F.R.S. 
This Quarterly is now in its fourteenth year of publication. Its 
object is to give all readers of wide culture and interest in science 
a knowledge of the numerous advances which are being continually 
made in connection with scientific work and thought. Each number 
contains Recent Advances in Science (by a number of experts); 
Articles, Popular Science, Essay-Reviews, Correspondence, Notes, 
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quarter by John Murray, 50a Albemarle Street, London, W. Annual 
Subscription 25/6 and price of one number 6s. Subscriptions 
through bookseller or direct to the Publisher. 
“ Science Progress, which has now reached its thirty -ninth 
number, not only covers a remarkable wide field with great 
ability, but has had impressed upon it, by the energetic and 
humane spirit of its editor, a certain dynamic quality which 
makes it a force as well as a source of light ." — The Times t 
Printed at Browns’ Savile Press, 40 George Street, Hull, and published by 
A. Brown & Sons, Limited, at 5 Farringdon Avenue, in the City of London. 
Oct., 1922. 
