168 Notes on the first Appearance of the Aphis Lanigera. 



July 26, 1796. In Sussex, at Lewes and Sheffield Place, no 

 insects had been heard of. 



29. Smeared two Codlin trees with soft soap and flour of 

 brimstone. 



30. Saw the insects in Mr. Chalie's garden at Wimbleton. 

 August 4. Mr. Dalrymple tells me, that a friend of his 



had some Apple trees infested with the insect four or five 

 years ago : he lighted a smoaking fire under them, which 

 killed the whole ; and the trees have not suffered since ! I 

 doubt : fire is lighted under the Nopals in Mexico, at parti- 

 cular times, with dry horse dung, and the smoke does the 

 insects no harm. 



9. Saw the insects at Addiscombe, near Croydon ; the gar- 

 dener has observed them about three years. Saw them after- 

 wards at Thames Ditton, as I passed the road, on the Apple 

 trees, and abundantly on the Crab trees in the hedges oppo- 

 site Hampton Court. 



Feb. 19, 1797. Mr. Murray, gardener at Kensington, 

 called upon me, and shewed me some of the insects alive on 

 an Apple tree branch. The frost in the winter was not of 

 long duration, but Mr. Cavendish's thermometer at Clap- 

 ham, was one night at 6 degrees below zero. For these five 

 days past, the weather has been frosty in the night ; once the 

 thermometer was at 23° in the day. The sun has shone this 

 day, and the thermometer has been at 40°, or upwards. 



Mr. Murray tells me, that he purchased, ten years ago, 

 some Paradise stocks from the foreign nursery in Sloane -street, 

 and that he first observed the insect on the roots of these, 

 without knowing what it was. He thought it worth his pains 

 to wash these stocks, but that did not destroy the insects, 



