XLV. " The Use of Charcoal as a Medium for Plant Growth.'' 

 A. Applevard. Journal of the Royal Horticultural 

 Society, 1915. 40, 473-5- 



A considerable number of experiments are on record in Horticultural 

 Journals^ which seem to show that charcoal has considerable \alue in 

 increasing soil fertility. A summary of the evidence is given with a 

 view to further work on the subject. 



PAPERS SUMMARISING RECENT PROGRESS IN 

 AGRICULTURAL INVESTIGATIONS. 



I. " The Principles of Crop Production." E. J. Russell. Trans 



actions of the Chemical Society, 1915- 107, 1838-1858. 



II. "Artificial Fertilisers, their Present use and Future Prospects."' 



E. J. Russell. Journal of the Society of Chemical Industry. 

 1917- 36, 250-261. 



III. " The Masters^ Lectures : Recent Investigations on the Pro- 



duction of Plant Food in the Soil." E. J. Russell. Journal 

 of the Royal Horticultural Society_, 1916. 41, 173-199. 



IV. " The Recent Work at Rothamsted on the Partial Sterilisation of 



Soil." E. J. Russell. Bulletin of the International 

 Institute of Agriculture, Rome. 191 7. 8, i-n. 



V. " The Making of Soil." E. J. Russell. Transactions of the 



Highland and Agricultural Society of Scotland, 1916. 28, 1-32 



A description of the processes involved in the making of the soil as 

 they are at present understood. So far as the mineral particles are 

 concerned, the processes are largely beyond control, but the organic 

 constituents can be altered more readily, especially by green manuring 

 and clover and grass leys of varying duration. The micro-organic 

 population which brings about the necessary changes in the organic 

 matter is hardly yet under control, though a beginning has been made ; 

 attempts are also in progress to deal with the various insects, etc., 

 which play an important part in agriculture. 



BOOKS PUBLISHED. 



The following books and new editions have been published during 

 the past two years : — 



I. " Manuring for Higher Crop Production." E. J. Russell. 



Cambridge University Press. 



ist edition, 1916. 2nd edition, revised and enlarged, 1917. 



II. " Soil Conditions and Plant Groivth." E. J. Russell. 

 Longman, Green & Co. 



3rd edition, revised and enlarged, 1917. 



lir. " Soils and Manures." E. J. Russell. Cambridge 

 University Press. 

 2nd edition (in the press). 



IV. " The Book of the Rothamsted Experiments." A. D. Hall. 

 2nd edition, revised by E. J. Russell, 191 7. John Murray. 



