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 OP ECONOMIC 

 BIOLOGY 



E»lit*tl by 

 WALTER E. c;OLLINGE, 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 

 remain, price 2ls. each. Volume 10, now in course of publication, 

 will consist of four part*, price 21."?. 



All editorial' communicati&tis should be addressed to Walter E. Collhige, 

 8, JfewhaM Street, Birmvngham, avd all svhscriptiona to 



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

 Berlin: R. FRIEDLANDER & SOHN. 



