PARIS-GREEN. 
91 
in misty dew on the leaves, we give twice the quantity, that is, a 
quart, we only distribute one-fortieth of an ounce of the Paris-green, of 
which, according to the percentage analysis, only about a third (32-11) 
is arsenic. 
I think the above calculation is worth notice as a key at least to 
understanding the foundation and essence of success of our work, and 
also in order to be able to put it before those who endeavour to throw 
difficulties in the way of preserving our fruit crops by erroneous 
statements. 
We do not work by washing the trees down with unlimited amounts 
of poison dropping from the leafage; if we did, it would serve no 
purpose. What is sent in fine film is intended to remain merely as a 
light dew on the leaves. 
To recapitulate: taking, as I noted above, double the amount of 
spray estimated by Mr. Masters to be needed, this shows (to put it in 
plain words) the amount of arsenic deposited in film on the whole of 
the leafage of a large tree to be only rather less than the third of a 
fortieth part of an ounce—this on Plum, half that amount on Apple 
and Pear. 
Non-feeding of animals under sprayed trees. —As, however, it is totally 
impossible to guard against what may be done by careless workers, or 
those who will not take the trouble to understand what they are about, 
in all we (that is to say, the Experimental Committee as a body and 
myself personally) are desired to advise on, we most scrupulously direct 
that cattle and stock and other animals should never be allowed to pasture 
or feed under trees that are being , or have recently been , sprayed , for fear of 
injury from feeding on Grass on which there may have been drip. We 
give no opening for possibility of mischief occurring from this cause 
where our advice is followed ; but (having noted this duly) there is no 
harm in mentioning here that where the fine spraying is properly 
carried on, it is at least open to doubt whether any risk in the above 
way is incurred. 
In the course of reporting, it appeared that one observer fed his 
mares and foals beneath the Paris-greened trees with no ill effects. 
Mr. Lee Campbell, of Glewstone Court, Ross, also alluding to this 
point, wrote me:—“ You will recollect that I sprayed the trees this 
year ten times with Paris-green, partly 2 ozs. to the 20 gallons, and 
later with only one, and during the caterpillar season (in fact, all the 
year until the fruit was becoming ripe) fowls have had a free run all 
over the field.” 
I have also received a report to a similar effect from Messrs. Salmon, 
of Sutton, near Hounslow, who were very successful in the use of 
Paris-green, relatively to small birds. They informed me that they 
had neither found dead birds nor seen any signs of harm caused by the 
application in their sprayed orchard grounds. 
