MANSFIELD'S OIL GAS APPARATUS 



PLANT FOR PRODUCING 



GAS FROM HEAVY OIL OR FAT 



on a small scale 



This plant provides an efficient gas supply for 



Laboratories out of the reach of a Town's 



Gas Supply 



MANSFIELD & SONS, Ltd., 



14, Hamilton Square, Birkenhead, England. 



THE 



JOURNAL OF ECONOMIC 

 BIOLOGY 



Edited by 

 WALTER E. COLLINGE. M.Sc, F.L.S., F.E.S. 



Contains articles treating of all branches of Economic Biology, 

 Entomology, Parasitology, Mycology, etc. Fully illustrated by 

 lithographic plates and text figures. A few sets of Vols. 1 — 9 still 

 remam, price 21s. each. Volume 10, now in course of publication, 

 wiU consist of four parts, price 21.s. 



All editorial communications should be addressed to Walter E. C oiling e, 

 8, NewhaU Street, Birmingham, and all subscriptions to 



London: DULAU & CO., Ltd., 37, Soho Square, W. 

 Berlin: R. FRIEDLANDER & SOHN. 



