560 THE GREEN-HOUSE [FEB. 



greater degree than as if they were growing in 

 pots. 



Neither should the syringe or engine be yet ap- 

 plied to the foliage ; but it may towards the latter 

 end of the month or the beginning of March ; as 

 the sun will then begin to be powerful, and have 

 the effect of evaporating the moisture lodged on the 

 tender or more downy leaves, which otherwise 

 might sustain injury. 



Of cleaning the Plants of Insects. 



About the middle or latter end of the month, the 

 plants may be revised for the destruction of insects, 

 as above directed for the plants in the green-house. 

 Those affected with the coccus or scaly insect, must 

 be carefully washed with soap and water ; obser- 

 ving to wash the leaves with pure water afterwards, 

 and to shake the whole plant well, in order to dis- 

 lodge moisture from the branches. 



If the green-fly prevail in the house, or indeed on 

 any of the plants, recourse must be had to the fu- 

 migating bellows and tobacco, which is the best, 

 and most speedy remedy ; also, for the thrips, if it 

 be found on the shoots or leaves of any of the ten- 

 der plants. In these cases, the house should be fu- 

 migated, in all respects as directed for the cherry- 

 house, in the Forcing Garden for February, p. 340, 

 which see ; and which should always be repeated 

 on their re-appearance, or very soon afterwards. 



These fumigations may be performed, with safe- 

 ty, at any day in the year ; and washing with soap 

 suds, for the destruction of the coccus and chorines, 



