i 98 The Principles of Part V. 



the corn is a remedy for this, as it fends the 

 juice to the ftalk. 



EXTERNAL accidents, fuch as froft, hail, 

 flies and their eggs, vermin, Gfc. give rife 

 to many difeafes. There is a fmall white 

 hard worm very common in new ground, 

 which deftroys plants by eating their roots. 

 Thefe worms are killed by quick-lime or 

 Jime-water. 



THE mildew is to be ranked here, as it 

 feems to be owing to a gluy faccharine 

 matter falling with a fummer fhower, and 

 blocking up the perfpiration of the plant. 

 This matter may be felt and tafted on the 

 furface of the leaves. That it operates in 

 this way, appears from the following fact. 

 There is in the Brian^on, a fpecies of nut- 

 tree, which has all its leaves covered with a 

 faccharine fubflance, arifing from the per- 

 fpiration of the juices of the plant. If it 

 is in very great quantity, the trees often 

 die, 



AMONGST 



