CALIFORNIA. 79 



Progress was made in the Adams fund work of the station, and 

 some of the projects were brought to a close. The study of the 

 rehition of marly soils and of lime to chlorosis of citrus fruits was 

 continued with the addition of bacteriological studies of soils. 



In the work on artificial immunization of cattle against tubercu- 

 losis the testing of bovovaccine was completed. The vaccine failed 

 to immunize longer than three years, and the amount of protection 

 for two and one-half years was about 50 per cent. Three papers have 

 been published on this line of work. 



The investigation on the control of the scales attacking citrus trees 

 was continued, and in this connection an apparatus for making deter- 

 minations with reference to the necessary strength of cyanid of potas- 

 sium needed according to the size of the tree, the fabric of the tent, 

 leakage, etc., was devised. Studies were included on the conditions 

 governing the destruction of the scale egg, and much work was in 

 progress in both field and laboratory. 



Digestion experiments with poultry were made with difierent grains 

 and concentrated feeds in various combinations. A considerable 

 amount of data has accumulated in these experiments and is awaiting 

 publication. 



The study on the influence of environment on the gluten content of 

 grain received a great deal of attention, and two bulletins based upon 

 this work were published. A comprehensive study was made of the 

 California white wheats, and a report on their chemical composition, 

 including their gluten content and their value for milling and baking 

 purposes, together with a progress report upon soil and climatic 

 factors influencing the comjDOsition of wheat, was published. 



Work on the nature of certain physiological plant diseases was 

 carried on at AMiittier, several physiological troubles of citrus trees 

 being under investigation. A report on the giun disease of citrus 

 fruits was made sometime ago. A special study was made of the 

 relation of soil conditions and of the general influence of heredity and 

 environment. 



The investigation on the sterility of almond trees was continued, 

 and the results secured were confirmatory of previous data. It has 

 been found that the pollen is very largely defective and that there is 

 comparatively little self-fertilization. 



Progress was made in the work on walnut-oak hybrids, a consider- 

 able number of pollinations have been made, and a number of hybrids 

 obtained. Brief reports covering part of this work were prepared. 

 The work on Nicotiana hybrids was practically brought to completion 

 and awaits the preparation of the report. 



A number of different lines of work carried on with Hatch and 

 other funds were conducted in different parts of the State. At Davis, 

 variety and breeding experiments with cereals were in progress, and 



