202 SCHOOL AND HOME GARDENS 
one half of the capacity of the vessel, and fill it nearly 
full of water. In three or four days a brown liquid will 
be extracted from the manure. If this is very strong, 
it should be thinned to a light-brown color before apply- 
ing it to the roots of plants. The vessel may be refilled 
several times. 
Liquid manure is one of the best fertilizers for house 
plants, as well as for the garden. Apply the manure 
every two or three weeks; then water freely, to carry 
the nourishment to the roots of the plants. Garden 
plants may be given a very liberal supply by removing 
the rose of the sprinkler and pouring the liquid around 
them 
How to pEestroy INSECTS 
Biting insects. Some insects bite or chew the plants 
on which they feed. These may be killed by spraying 
poisons on the parts which they eat. Caterpillars have 
jaws and always chew their food. All beetles and 
weevils have biting mouth parts. 
Sucking insects. Other insects have sucking mouth 
parts. They thrust their beaks into the tissues of the 
plants and suck the juice. Such insects cannot be killed 
with stomach poisons. Instead, a “ contact insecticide,” 
something that kills the insect when it comes in contact. 
with it, must be used. Plant lice. seale insects, and bugs 
must be killed with contact insecticides. 
