Se6t. V. Agriculture and Vegetation. 1 97 



laves all the unaffected. All difeafes from 

 defeat of nourishment, are cured by the ap- 

 plication of manures. 



THE juices may be, likewife, faulty from 

 their bad quality. When the turpentine 

 juices of the pine and fir turn too thick, the 

 tree is fuffocated. Sugar canes, it is faid, 

 do not thrive fo well in rich new foil, be- 

 caufe it affords too oily a juice, which is not 

 fo good for fugar : if they are cut when fix 

 months old, the leaves burnt, and the ames 

 laid round them, they afford better fugar. 

 The alkaline fait, from the ames of the 

 leaves, attenuates the oils, and makes a better 

 faccharine juice. Plants or feeds tranfported 

 from warmer countries to cold, decay gra- 

 dually, becaufe the juices are not fufficiently 

 attenuated for want of heat. 



THE unequal diftribution of the juices 

 fcems to be another caufe of vegetable dif- 

 eafes. In corn, the juice fometimes runs 

 too much to the leaves ; cutting or eating 

 O 3 the 



