( 36 ) 
be accessible underneath. Bath-rooms and out- 
buildings should preferably be raised, and not built 
on the ground, as is frequently done. 
In the case of temporary outbuildings, m^in timbers 
should not be sunk in the ground, but should be 
sunk in concrete, after being treated with creosote. 
Insecticides. 
The following notes give a simple method of pre- 
paration for insecticides obtainable in this country. 
Arsenate of According to circumstances, from 2 to 
Lead. 10 lbs. of the powder may be used in 
100 gallons of water. The quality ob- 
tainable at present is uncertain and burning of the 
leaves of plants sprayed with this solution should 
be watched for. 
It is sometimes impossible to obtain an even spread 
by the use of water alone, and soap may have to be 
added in the proportion of 5 lbs. to 100 gallons of 
water. This has the effect, however, of increasing 
the liability to burning but, if the quality is attended 
to and only an Oleic acid soap used, this danger is 
reduced to a minimum. 
Kerosene This is used for sucking insects and 
Emulsion. kills by contact, not by injestion. It 
consists of a mixture in the proportion 
of water (1 gallon), soap (i /2 lb.) and kerosene (2 
gallons). 
Dissolve the soap in the water by boiling, remove 
from the fire, and stir in the kerosene to make a 
creamy emulsion. The emulsion is readily obtained 
by the use of a garden syringe. Crude oil can be 
used instead of kerosene. For spraying, the emul- 
sion is diluted by using 1 part in 10 to 20 parts of 
water. 
