( 3 ) 
* not too strong. Neither of these strengths of mixture 
damaged the leafage, but they killed the caterpillar. 
These proportions should not be exceeded. —In some instances 
greater strength has been used without bad effects on the 
leafage; but this was certainly attributable, in one case, 
to heavy rain following the over-application, and probably, if 
details were procurable, non-injury from over-strength could 
be traced to casual coincidence in other cases also. 
Capt. Corbett, the Superintendent of the Toddington Fruit 
Grounds, writing to me on the 3rd of July, and mentioning his 
satisfaction with the results of spraying, also noted, “ The pro¬ 
portions I fixed upon after the first trials, viz., 1 oz. to 10 
gallons of water for Plums, and 1 oz. to 20 gallons of water 
for Apples, must not be exceeded.” 
“ Paris-green ” is an aceto-arsenite of copper, and of a poisonous 
nature , and therefore should be used with care in mixing, and 
should never be applied to fruit or to vegetables that are used for 
food. But, as is shown above, the quantity to which, in order 
to be beneficial, it is requisite to limit application in spraying is 
excessively small, and our English experiences of the past 
season, as well as those on the Continent of America where 
Paris-green has been used regularly in farm and orchard pre¬ 
vention for many years, show that with proper care it may be 
used with perfect safety. 
The cautions to be observed in the use of Paris-green are :— 
The bags should be labelled Poison and kept locked up, and 
especially kept safely out of the way of children, who might 
be attracted by the beautiful green colour of the powder. 
Workers with the powder should not allow it to settle in any 
sore or crack in the skin of the hands, nor stir it about 
unnecessarily with the hands ; and they should be very careful 
not to breathe in the powder through mouth or nose whilst 
measuring or mixing it. 
For this reason it is most desirable that purchasers of 
Paris-green should have it sent not in bulk, to be divided for 
use on receipt, but wrapped in single pound (or small) 
packages by the senders, or, what is better still, have it in 
form mentioned opposite as “ Paris-green paste,” that is, the 
powder just damped so that it cannot fly about. If swallowed 
in any quantity by being drawn in with the breath it would 
certainly be harmful. An instance is on record in which a 
man employed to weigh out and wrap 5 cwt. in 1 lb papers 
lost his life therefrom. But with the most ordinary care the 
application may be mixed and used, as well as hellebore and 
other poisons often applied in orchard and other farming 
work, with perfect safety. 
