REFERENCES 149 



result be due to manuring only, for on the small plots in the 

 Hoos field all sorts of variations in the manuring were tried, 

 without enabling the clover to stand. On the grass paths, 

 however, separating these "clover sick "plots on Hoos field, 

 paths which are not more than a yard broad, both red and 

 white clover grow abundantly. Were " clover sickness " due 

 merely to the infection of the plant by Sclerotinia trifoliorum, 

 it is difficult to see how these plants could escape infection 

 when the neighbouring clover plants in the arable land 

 succumb. These and other facts would seem to show that 

 the presence of the fungus Sclerotinia trifoliorum is not the 

 determining cause of "clover sickness"; in many cases it is 

 the direct cause of the death of the clover plants, but what 

 is not yet understood is why plants on "clover sick" land 

 alone succumb to the infection. 



" Report of Experiments on the Growth of Red Clover by different Manures." 



Jour. Roy. Ag. Soc., 21 (1860), 178. Rothamsted Memoirs, Vol. I., 



No. 13. 

 " Notes on Clover Sickness!" Jour. Roy. Hort. Soc., 3 (1871), 86. Rothamsted 



Memoirs, Vol. III., No. 12. 

 " Results of Experiments at Rothamsted on the Growth of Leguminous 



Crops for many years in succession on the same land." Agricultural 



Students Gazette, New Series, 4 (1889), 137, and 4 (1890), 179. 



Rothamsted Memoirs, Vol. VI., No. 15. 

 " The Rothamsted Experiments : being an account of some of the Results 



of the Agricultural Investigations conducted at Rotharasted." Trans. 



Highland and Agricultural Society of Scotland, Fifth Series, 7 (1895), 



100-136. 

 " The Accumulation of Fertility by Land allowed to Run Wild." A. D. Hall. 



Jour. Agric. Science, I. (1905), 241. 



