TTew Toek Agricttltueal Expeeiment Stations". 157 



dne to a gradual decrease in the supply of water in the soil, but 

 that it had been brought about suddenly. Some time during the 

 first two weeks in August, probably about August 9, the weather 

 conditions (temperature, humidity and wind) had been such that 

 the quantity of water transpired by the leaves was greater than 

 the roots were able to supply. As a result the leaves were scorched. 

 Then, with the passing of the conditions which induced excessive 

 transpiration, the roots were again able to meet the demands for 

 moisture thereby enabling the plants to resume growth, although 

 the soil was drier than at the time the injury occurred. 



It has already been stated that some of the plants were killed 

 outright. Upon a third visit to the affected field at Stanley, 

 made October 24, it was observed that these dead roots were still 

 sound except for brown, mostly V-shaped, scab-like areas upon 

 the upper portion of the root. These brown areas represent the 

 later stage of the raised, discolored areas observed on August 29. 

 The tissne was decayed to a depth of from one-eighth to one- 

 quarter of an inch and had been quite generally eaten away by 

 millipedes, leaving cavities where in the earlier stage of the di- 

 sease there had been elevations. (See Plate VT.) Underneath 

 the affected areas the sonnd tissue showed the same light brown 

 discoloration as on Angnst 29. It seemed to have progressed, bnt 

 little, if any. Sometimes the browning occurred in the central 

 portion of the root, but usually it was found only around the 

 circumference and almost always in the form of concentric rings. 

 Tn the field at Stanley the dead roots quite generally showed the 

 light brown discoloration of sound tissue, but in an affected field 

 at Bellona it was a common thing to find bad cases of the disease 

 in which there was little or no internal browming. 



The plants which survived made a considerable growth of new 

 foliace. The roots of such plants did not commonly show any 

 discoloration or decay, bnt, strange to say, they averaged consid- 

 erably smaller than the roots of plants which had been killed 

 outright. This indicates that the plants which were the largest 



