120 Agricultural Experiment Station, Ithaca, N. Y. 



collenchyma and the cortical parenchyma shows a very turgid condi- 

 tion as compared with the same tissue on the opposite side of the stem 

 as shown in the right hand figure. The structural features of these 

 artificially induced cushions do not differ from those induced 

 under the operation of the natural forces, and we are justified in con- 

 cluding that this experiment forms additional cumulative evidence that 

 the phenomenon is a result of the unequal operation of the physiologi- 

 cal processes concerned in plant growth. 



Cultural Mcperiment. In view of the large quantities of water 

 absorbed by the roots in excess of the actual transpiration, a cultural 

 experiment was suggested to be governed by such conditions as might 

 be quite easily obtained in the soil of the bed where the plants grew 

 which were most seriously affected. For this experiment twelve potted 

 plants of the Lorillard variety were selected, because that variety 

 seemed to be more resistant than the No. 18. 



December 7th, they were placed on boards which rested on the soil 

 of the bed at the south side of the tomato house where the plants of 

 variety of No. 18 were growing. They were allowed to remain in this 

 condition for two days without any water, when the soil was quite dry 

 and the leaves were limp. They were then divided into four lots of 

 three each. 



Those of lot No. 1 were removed from the pots and transplanted in 

 the soil bed near affected plants at the east end of the bed, the soil 

 having been stirred previously and allowed to become partially dry. 



Those of lot No. 2 were allowed to remain in the pots on the boards. 



Those of lot No. 3 were removed from the pots and transplanted in 

 the soil of the bed by the side of affected plants at some distance from 

 those of lot No. 1. 



Those of lot No. 4 were transplanted to soil by the side of the walk 

 where were other affected plants. 



Lots 1 and 2 were now given from day to day only sufficient water 

 to keep them growing slowly, but not enough so that at any time the 

 plants could become very turgid. 



Lots 3 and 4 were supplied with sufficient water to keep the soil 

 nearly saturated, enough so that the roots could absorb all the water 

 possible at their highest activity, but not so much as to interfere with 

 that activity. The plants of lots 3 and 4 were therefore kept very 

 turgid by the large amount of water absorbed in comparison with that 

 given off at the leaves, and in a few days the cushions of radially 



Note — I wish to acknowledge here the generous assistance in carrying on 

 these experiments rendered by Professor Bailey and Messrs. Corbett and Lode- 

 man of the Horticultural Department. 



