422 CONSTITUTIONAL DISEASE. 



stitutional,yet there is a large class of the latter which 

 have not been sufficiently studied to be described 

 in detail. They are undoubtedly those which result 

 from causes analoo;ous to inflammation in the animal 

 system, taking that term in its largest acceptation ; 

 yet their proportion is small. In some cases, during 

 the inflamed condition of the organ there is an in- 

 creased degree of heat, like that so often accompany- 

 ing the same state in animals ; while in other cases 

 no difference in the temperature is perceptible.^ M. 

 Huber found when the heat of the atmosphere stood 

 at twenty-one degrees centigrade, that the instrument, 

 surrounded with spadices of the arum cordipolium, 

 during the process of fecundation, rose as high as 

 forty-two degrees. While plants have not as definite 

 a form as animals, and it is therefore more difficult 

 to detect malformation, yet they exhibit a peculiar 

 sensitiveness to external influences during their 

 growing season. 



Mons. J. De Jonghe, of Brussels, states the causes 

 wdiich produce disease in fruit trees as follows : ^ 



1st. Constitutional weakness of the variety/. Some 

 sorts are weak because the conditions in which they 

 are placed are unflivorable ; j)6rhaps they originated 

 in a warmer region, and the severity or vicissitudes 

 of the climate induces disease. Other varieties are 



1 Gross's Elements of Pathological Anatomy. 



2 In a paper published iu " Gardeners' Chronicle," vol. for 18-57. 



