XII 



The Romler & HassUer Cheical Co. 



100 Willife^m Street, New York 

 Works: Perth Amboy, N. J. 



CYANIDE 



Guaranteed 98-99 per cent. 



For generating Hydrocyanic Acid Gas. 



The only positive eradicator of the San Jose Scale, 

 Red and Black Scale and other insect pests. 



Please mention the Journal of Economic Entomology when writing to advertisers. 



