110 proceedings: botanical society 



and delighted to watch their morphological responses to changes of 

 environment. He devised methods of describing and tabulating the 

 minute differences of individual plants, as may be seen in his published 

 papers. The following list of United States Department of Agricul- 

 ture publications indicates the nature of his studies: 



Supernumerary Carpels in Cotton Bolls. Bur. PI. Ind. Circ. 111. 



Methods of Securing Self-Pollination in Cotton. Bur. PI. Ind. 



Circ. 121. ,. . , . . ^ _ 



A Study of Diversity in Egyptian Cotton (joint author with O. F. 

 Cook and A. McLachlan). Bur. PI. Ind. Bull. 156. 



Arrangement of Parts in the Cotton Plant. Bur. PI. Ind. Bull. 222. 



Single-Stalk Cotton Culture at San Antonio. Dept. Bull. 279. 



Roland Meade's many friends in this Society and the Department 

 of Agriculture will always remember him as a clean, lovable young 

 man of great promise, who was cut off at the beginning of his life's 

 work. 



Experiments in the use of peat in the greenhouse (with lantern) : H. C. 



Thompson. 



Four years experimental work in growing greenhouse crops on 

 muck soils shows that there is a greater difference in the productive- 

 ness of the various types than can be accounted for on the basis of 

 fertilizing elements present. Three types of muck soil were used in 

 the experiments. The type showing the smallest percentage of ni- 

 trogen and potash produced the largest yields of lettuce, cauliflower, 

 and tomatoes. This was true of the pure muck plats as well as all 

 plats containing muck and clay mixtures (mixtures 75 per cent muck 

 and 25 per cent clay, to 12.5 per cent muck and 87.5 per cent clay). 

 The difference in yields where the various types of mucks were used was 

 probably due to the physical condition and to the organic life in the 

 soil. In a field experiment the muck showing, on analysis, the high- 

 est nitrogen content gave the greatest increase in yield when manure 

 was used. This increase from manure could not possibly be ac- 

 counted for on the basis of plant food, as plats treated with large quan- 

 tities of complete fertilizers showed a still greater increase when manure 

 was applied. The manure was of special value in inoculating the soil 

 with beneficial organisms. The muck producing the largest yield in the 

 greenhouses showed no increase from the use of manure that could 

 not be accounted for on the basis of plant food. It is interesting to 

 Qote that the soil producing the largest yield in the greenhouse has 

 been under cultivation much longer than the one producing the smaller 

 yield. 



The soil giving the best results produced good yields of lettuce, 

 cauliflower, tomatoes, carnations, and roses. With the first two crops 

 the pure muck plats produced the largest yields, while with tomatoes, 

 carnations, and roses the mixture containing 50 per cent muck and 50 

 per cent clay produced the largest yields. All mixtures containing 50 

 per cent or more muck produced greater yields of lettuce, cauliflower, 



id tomatoes than a mixture containing 3 parts clay, 1 part sand, and 



