36 Dtrector’s Report OF THE 
The raspberry saw-fly.— The life history of this insect has been 
studied and experiments made to ascertain a remedy. Good re- 
sults were obtained with hellebore. Original observations have 
been made upon the various stages of the insect’s life, especially 
the larva, pupa and the adult male. 
The San José scale.— Extensive experiments against this insect 
have been begun. The experiments include tests with pure 
kerosene oil and kerosene oil mechanically mixed with water in 
the proportions of 20 per cent and 40 per cent oil, also whale oil 
soap solution and a solution of caustic potash at various strengths. 
In the experiments with kerosene oil, a large number of healthy 
nursery and orchard trees of various varieties have been sprayed 
to ascertain the effect of the kerosene oil upon healthy trees. 
DEPARTMENT OF ANIMAL INDUSTRY. | 
The economy of using animal food for poultry.— A number of 
feeding experiments have shown almost invariably an advantage 
in the use of rations containing animal food over rations con- 
sisting entirely or largely of vegetable food. The data from some 
of the experiments made to determine the relative efficiency of 
vegetable and animal food have been published. The points 
brought out by these data are indicated in the following summary. 
A ration in which about two-fifths of the protein was supplied 
by animal food was much more profitably fed to chicks than 
another ration supplying an equal amount of protein mostly from 
vegetable sources but supplemented by skim-milk curd. 
When the two rations were fed to cockerels also, the results 
were favorable to the animal food, but the difference was not so 
pronounced as with the chicks. 
Pullets fed the ration containing the large proportion of animal 
food attained ultimately somewhat the larger average size, but the 
chief advantage over those fed the contrasted ration was in the 
more rapid growth and earlier maturity. —- 
With ducklings much the better results accompanied the feed- 
ing of a ration in which about half the protein was supplied by 
