€8 
The following doses of arsenic are dangerous: two grains 
for an adult, thirty grains for a horse, ten grains fora cow, 
one-half to one grain for adog. In cases of poisoning treat- 
ment is never hopeless. For persons give hot milk and water, 
and tickle the throat with a feather to induce free vomiting. 
Sugar and magnesia inmilk is also a good antidote. Another 
remedy is also readily prepared: pour together solutions of 
perchloride of iron and dilute ammonia; the brown precipitate 
that forms should be strained off and given with water. 
There are certain seasons in which our potato-plants suffer 
more or less from vegetable diseases, or diseases caused by 
lowly organized plants. It has been found that the use of Bor- 
deaux mixture is a preventive if not a cure. If our potato- 
fields are infested with the potato-blight or other diseases, and 
also invaded by potato-beetles or other insects, it is wise to ap- 
ply insecticides and fungicides at the same time, because this 
will save time. A good mixture of both is the following: add 
2 ounces of Paris-green or London-purple to 22 gallons of Bor- 
deaux mixture. This latter is made by dissolving 6 lbs. of 
blue vitriol (copper sulphate) in 16 gallons of water, and 4 lbs. 
of unslaked lime in the other six gallons of water. Mix both 
fluids after stirring and straining the whitewash. The cost of 
this mixture is about 14 cents per gallon. 
BLISTER BEETLES. 
(Epicauta pennsylvanica De G.) and ( Macrobasis unicolor Kirby. } 
Several species of these beetles attacked potatoes and caused 
more or less injury in some fields. These beetles were former- 
ly the only insects destructive to this plantand were known 
long before the Colorado potato-beetle made its way east, and 
consequently they are frequently called the ‘‘old-fashioned 
potato -bugs.” The history of these blister-beetles is a very 
interesting one. While very destructive to a number of cul- 
tivated plants besides the Irish potato, as for instance beans 
and vetches, they are so only in their winged stage. Their 
young or larvee are decidedly beneficial, as they eat nothing 
but the eggs of grasshoppers. This is the reason that blis- 
ter-beetles are always more numerous in years following a dry 
season, aS dry seasons are greatly in favor of grasshoppers. 
