1892.] PUBLIC DOCUMENT — No. 33. 239 



Materials. — For the convenience of persons who may 

 wish to purchase the necessary materials for the preparation 

 of fungicides, the writer has communicated with several 

 reliable houses in some of the larger cities of the State, and 

 has received from those named below favorable replies as to 

 their readiness to till orders promptly, and as to prices. 

 He can, therefore, recommend these firms to persons wish- 

 ing fungicide supplies, without in any respect implying that 

 there are not many others equally reliable : — 



Weeks and Potter Company, 360 Washington Street, Boston. 

 Messrs. E. & F. King, Boston. 



Talbot Dyewood and Chemical Company 24 and 26 Middle 

 Street, Lowell. 



Jerome Marble & Co., Worcester. 



Messrs. H. & J. Brewer, 463 Main Street, Springfield. 



Concerning the cost of the various materials named above 

 no very exact figures can be given, since prices vary with 

 the state of the market and according to the quantity ordered. 

 Prices per pound are considerably higher for small quantities 

 than for larger ones, and the substances cost much less in 

 original packages than in smaller lots. A large saving can 

 be affected if several persons will combine in ordering what 

 they need, both in the cost per pound of the chemicals and 

 in cost of transportation. The following quotations may be 

 given as the approximate prices of the various substances in 

 small lots, at retail, and discounts from these prices will 

 increase with the amount of the order : — 



Cents 

 per Pound. 



Copper sulphate, 8 



Copper carbonate, . 60 



Ammonium carbonate, 15 



Sodium carbonate, 3 



Aqua ammonia (24°), 10 



Potassium sulphide, . . 25 



Application. — In the case of diseases caused by fungi 

 which spread from plant to plant during the growing season, 

 the necessary protection is afforded by applying the fungi- 

 cides in the form of a very fine spray to the surface of the 

 plants until they are thoroughly wetted. This, drying, 



