54 



LXXW K. j. Russell. "The Artificial Feeding of Crops/' 

 Discovery, 1923. 



LXXV'I. E. J. Russell. "The Influence of Geographical 

 Factors on the Agricultural Activities of a 

 Population." Geo^'^raphical 'I'eaiher, 1923. 



LXXV'If. ''(\italogues of Jour}uils (uul Periodicals in the 

 Rothanisted library." 



BOOKS PUBLISHED DURING 1921-22. 



A. D. Imms. "A General Textbook of Entoniology." IMethuen 

 & Co., Ltd. (in the press). 



v.. J. Russell. " Farm Soil and its Improvement." Benn Bros, 

 (in tpe press). 

 W^ritten for the working- farmer. 



E. J. Russell and Members of the Stafl' of the Rothamsted Ex- 

 perimental Station. ''The Micro-organisms of the Soil." 

 A series of lectures delivered at University College, London. 

 Long-mans, Cireen & Co. (Rothamsted Memoirs on Ag-ricultural 

 Science). 



Winifred E. Brenchley. "Manuring of Grass Land for Hay." 

 Longmans, (jreen & Co. (in the press). 



This monograph embodies a comparison between the aspects 

 of the Park Grass plots at the present time with that about 40 

 years ago when Lawes, Gilbert & Masters published their accounts 

 of the experiment. 



Complete separation of samples of hay from every plot were 

 made in 1914 and 1919, and the analysed results have been com- 

 pared with those of the four earlier analyses up to 1877. In every 

 case an outline is g-iven of the present condition of the plot, with 

 lists of the species occurring- and their relative abundance. The 

 principal changes during the experimental period are outlined, 

 particular attention being given to the effects brought about by 

 regular liming of one half of some of the plots since 1903. 



The most striking alteration brought about by liming in the 

 botanical composition of the herbage is the remarkable increase 

 in the amount of foxtail {Alopecurus pratensis) on the heavily 

 manured plots, and the corresponding, though less marked, 

 reduction in Yorkshire Fog [Holcus lanatus) and vernal grass 

 [Anthoxanthum odoratuni). 



The figures of the botanical analyses are given in the form of 

 tables in which different types of manuring are grouped together, 

 and certain of the results are more clearly indicated by graphs. 

 The results as presented deal solely with the Rothamsted plots on 

 heavy soil and no attempt is made to compare them with other 

 more or less similar work on different types of soil elsewhere. 



The intention of the monograph is to attempt to round off and 

 complete the work begun by Lawes &' Gilbert in order to suggest 

 possible lines along which future developments of experimental 

 work on meadow land might profitably extend. 



