36 Director'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 Jose 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 w r ere 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 



