48 



Autumn, be a great means of their extinction, 

 and will tend in a great degree to check the 

 multiplication of the others. 



The last, and most pernicious of the species 

 mentioned, viz. the red spider, is to be over- 

 come neither by fumigation, nor picking ; 

 several are the methods, which have been in- 

 vented, to eradicate this insect from our hot- 

 houses, but I believe, most of them have been 

 found inadequate to the task, should they be 

 once allowed to establish themselves on the 

 plants. They may be brushed off, but this is 

 trifling, and in many instances injurious to the 

 plants ; because, the insects being left alive, 

 they soon find their way back to their former 

 station ; likewise, the young tender leaves are 

 liable to be scratched by the brush, in conse- 

 quence of w r hich, they ever after make but a 

 very unsightly appearance on the plants. Mix- 

 tures of sulphur, and such like materials are 

 are equally disagreeable yet may be occasion- 

 ally used : a gentleman of the first authority 

 assures me of the efficacy of the following. 

 Half a pound of flour of brimstone mixed with 

 a little whitewash and laid on the flue where it 

 is moderately warm, will destroy all the red 



