OF THE PINE-APPLE. 



315 



The Acarus does not seem to be affected by fu- 

 migations made with any ingredient that I could 

 hitherto discover, and I am inclined to think that 

 the apterous insects, or those without wings, are 

 not so much affected by fumigations as the winged 

 tribe. Indeed this species of insect has hitherto 

 been esteemed unconquerable, for which reason I 

 flatter myself that what I have to offer on this head 

 will not be the most unacceptable, or least useful 

 part of this treatise; for, from repeated trials, I can 

 venture to assure my readers, that the mixture re- 

 commended for destroying the insect on the 

 Pine-apple plant, will have the same effect on this 

 species also. It not only destroys the insects ac- 

 tually existing on the plants at the time of the ope- 

 ration, but also totally prevents their eggs from 

 coming to maturity, and consequently secures us 

 from the danger of a succeeding brood, without 

 the least injury to the plants. However, notwith- 

 standing this fair and promising prospect, I cannot 

 but very sincerely lament that the benefits of this 

 method do not extend so far as to be very service- 

 able either to melons in frames, or. fruit-trees 

 growing against walls in the open air: but as it 

 will be found exceedingly useful to plants kept in 

 hot-houses in general, I shall give such directions 

 respecting its application as I have found best to 

 answer the purpose. 



Plants greatly infested, and growing in pots, when 

 their tops are not very large, may, with great faci- 

 lity, be dipped in a convenient vessel filled with 



