Formula b. Mix thoroughly 6 oz. powdered ammoaia carbonate 

 and 1 oz. copper carbonate. Keep in air-tight vessels, and dissolve 

 in 10 gallons of water when used. 



This has the advantage of being quickly prepared and is inexpen- 

 sive. It has not been so well tested in New England as formula a, 

 and should be tried on a limited scale first before making the general 

 application. Never use Paris green with this mixture, and applica- 

 tions slionld not be made until the Paris green in the Bordeaux mix- 

 ture has been washed out somewhat bv rains. 



INSECTICIDES {Insect Destroyers). 

 We recommend but one insecticide in these instructions for the 

 reason that we have had very unsatisfactory results from the use of 

 the other arsenites, and others report much uncertainty in their 

 results from the use of London purple and white arsenic. 



Fig. 1, 



