PARIS GREEN AS AN INSECTICIDE. 149 

How to procure the powder. 
Large firms in Bombay or Calcutta, etc., will supply the 
arsenic. It is procurable at small cost (about Re. 1-4 per pound), 
and is known to the trade as “Paris-green’’ or “ Emerald- 
green’’. I believe Messrs. Blundell, Spence & Co. (Limited) of 
Hull and 9, Upper Thames Street, London, England, Colour 
Manufacturers and Exporters, would deliver quantities of 14 lbs. 
and upwards at 1s. per pound packed in one pound paper parcels 
or in paste state in large glass jars of 4 to 7 lbs. at the same price. 
Messrs. Hemmingway & Co., of 60, Mark Lane, London, E.C., 
also, I believe, supply the powder. 
Spraying machines. 
Various spraying machines have been invented. At first it 
will be sufficient to use an ordinary sprayer, but the nozzle must 
be a very fine one, so that the application may be made as a 
fine spray and not as a stream. This is essential. 
Should the apparatus be successful, it would be practicable 
to get one of the machines specially made for the purpose. 
Many firms make them and their catalogues could be obtained. 
A good one is an ordinary barrel mounted on wheels to hold, 
say, 36 gallons. Inthe rear a pump is fixed with two delivery 
pipes to which are attached whatever length of tubing may be 
required. Three men go with the apparatus, two men to spray 
and one to pump. 
The manufacturers are Messrs. Boulton and Paul, Rose 
Lane Works, Norwich. 
A knapsack form of sprayer known as the Chiswick Co.’s 
Sprayer can, I believe, be procured from the Planters’ Stores and 
Agency Co., Ld., 3, Mission Row, Calcutta. 
Spraying should not be done in a high wind, 
