1899.] PUBLIC DOCUMENT — No. 33. 159 



the same either in kind or degree. As a rule, the cutting 

 of primary organs, such as a shoot, will give rise, among 

 other things, to increased activities in the secondary organs, 

 such as a side shoot or side root ; and conversely the cutting 

 of a secondary organ or branch will stimulate the primary 

 organ or main shoot. Then, again, the effects of stimuli 

 caused by cutting are more marked near the source of in- 

 jury, and less marked the further away an organ is from it. 

 For example, the cutting of the main axis near an eye or 

 bud would give rise to increased activities in the axillary 

 bud, which would manifest itself in the development of a 

 new shoot. The nearer the cut to the e^^e or bud, the more 

 marked will be the stimulation, or resultant activities, and 

 the more completely will it assume the characteristics of the 

 primary shoot. The better condition the i)lants are in, and 

 the more suitable and available plant food with which they 

 are supplied, the more rapid will be the growth of the shoot, 

 and the more marked will be the correlative effects. Such, 

 in fact, are some of the laws governing correlation in plants. 

 In the case of the bronzing and subsequent death of the 

 axillary rose leaves, the stimulative eff'ect of cutting causes 

 a marked growth of the shoot, and the nutritive substances 

 are thereby utilized by this organ to such an extent that 

 some other portion of the plant is made to suffer. In this 

 instance it is the axillary leaf which finally becomes bronzed, 

 turns more or less yellow and dies. Iji other words, })rpnz- 

 ing is nothing more or less than a physiological disorder, 

 and falls under the domain of plant irritability. 



Cucumber Wilt. 

 The gi'owing of cucumbers under glass is carried on ex- 

 tensively in some places in this State, and a disease known 

 as the wilt has been reported to the station a number of 

 different times. Complaints in regard to this disease have 

 always come from certain localities where it has, as a rule, 

 been quite universal among the different growers. The 

 symptoms of the disease are a wilting of the plant, or, more 

 strictly speaking, of the foliage, whenever it is sul)jected to 

 the intense rays of the sun. 



