The Green Fly — Prevention. 135 



the operation should be repeated ; and by this pro- 

 cess, if carefully and thoroughly carried out at the 

 proper times, a crop already attacked may be saved; 

 but it requires thorough treatment. The tobacco 

 stems should be moistened before being used, or the 

 heat will be too much for the lettuce. Some skill and 

 discretion are necessary to determine just how much 

 to moisten them, and how to do the smoking in the 

 proper manner. On these points a practical experience 

 is the very best possible teacher ; and although some- 

 what costly at times, it affords one the most instruc- 

 tive lessons. After the first of February there is but 

 very little trouble with this insect. 



After the plants have been treated in this manner 

 they will be ready for transplanting into beds or 



Green-Fringed Lettuce. 



wherever required ; while if this treatment had not 

 been oriven them, quite likelv thev would have been 

 spoiled. Occasionally, it is true, these insects do not 

 trouble a crop at all ; but it is much the best policy to 

 be on the safe side and use every precaution. 



