112 SCIENTIFIC REPORTS OF THE AGRICULTURAL RESEARCH 



rapidly diminished. 2-5 per cent, is the optimum aimed 

 at for economy in production and stability of the product. 



Stability tests showed that solutions of this strength 

 could be made stable for six weeks at plains temperatures 

 (30° C.) and for six months or more at hill stations 

 (20°— 22° C). 



VI. Pebrine. 



The work on pebrine was taken over by Dr. A. Pringle 

 Jameson, Protozoologist, who arrived in October 1919. 

 Laboratory accommodation is being provided for him and 

 his staff in this Section. 



VII. Programme of work for 1920-21. 



1. Major subjects. 



General biology of soil — 



(a) Nitrogen fixation, symbiotic and asymbiotic. 



(b) Bacterial fermentation of organic matter in soils. 



(c) Influence of bacterial action on availability of 



phosphates in the soil. 



2. Special enquiries. 



(a) Indigo manufacture. 



(b) Other industrial problems connected with micro- 

 biological activities. 



3. Minor subjects. 



(a) Plant pathology. 



(b) Revision of laboratory methods in soil biology. 



VIII. Publications. 



Hutchinson, CM. . Beport on Agricultural Bacteriology, 



1918-19, for the Board of Scientific Ad- 

 vice. 



Hutchinson, C. M. . Pebrine in India. Mem. of the Dept. of 



Agri. in India, Vol. I, No. 8. (In the 

 press.) 



