97 
to be added. Twice or thrice watering with this 
liquor, he says, will destroy the vermin. 
In Sir G. S. Mackenzie’s observations to 
the Caledonian Horticultural Society, after re- 
marking, that of all the Recipes that have been 
announced, there is but one substance that can be 
applied with effect and safety, and that is smoking 
of tobacco, goes on to say, “ the easiest method 
of applying it to the trees on the open wall, is to 
hang over them mats or common sheeting, to con- 
fine the smoke.” 
Mr. Carr, of St. Ann’s, communicates a 
similar practice to the Caledonian Horticultural 
Society. He says, “ when the trees are troubled 
with insects, (I suppose meaning the Aphis), fumi- 
gation is resorted to. Previous to this operation, a 
large piece of convas, which has been saturated 
with oil, and almost become oil-cloth, but is more 
flexible, is suspended by hooks to the top of the 
wall, and held close to prevent the escape of the 
smoke. Its size may be about four yards and a half 
broad, and five and a quarter long. This oil can- 
vas suits also for dwarf fruit trees during fumi- 
gation, and this affords a very expeditious method 
of cleai’ing them from insects.” 
Weighton says he keeps them under by 
proper watering with the engine, and by pluck- 
ing off the first buds on which they appear. 
Mr. Parkes, F.L.S., in a letter to the 
Caledonian Society, in which he is endeavouring 
to establish common salt as a very valuable article 
