CORROSION OK GLASS. 
4s5 
neighbouring houses to support this strange contrivaucej never 
likely to produce a good foundation, ora well-established know- 
ledge. The nattirp of 
My first plan was to procure, by every possible means, a com- 
plete acquaintance with plants, both native and exotic ■, not of 
their namer and classes, (though the latter is certainly of great 
consequence) but of their form, nature, and habits ; their 
vessels, mechanism, and juices ; and when that task is complete, 
to turn to the philosophical part. May 1 not hope, then, that 
the public will bear with niy stupidity a little longer, and see 
the necessity of iny shewing the beginning, before I venture 
on the latter part, of my work. And if I live not to finish my 
labours, (which is most probable) I still hope, that the little I 
have done may suggest to others the necessity of completing 
the foundation before a system is thought of, or a theory laid 
down. 
I greatly regret, that the prints are now become much too 
large for insertion in your Journal, as they grow unintelligible 
when so much reduced, but when possible they shall always 
be added. 
V 
I am. Sir, 
Your obliged, humble Servant, 
AGNES IBBETSON. 
V. 
Remarkable Fact of the Glass of IFindou s being corroded by 
the Vapours from Copper Iforks. In a Letter from a Corres- 
pondent, 
To Mr. Nicholson, 
SIR, 
TTN visiting the copper smelting works near this town, I was effect 
much struck with the barren app>earaoce of the soil, and of the vapours 
with the leafless state and deadness of the trees for a conside- works^*^ 
rable distance round the works j but what excited my surprise 
the 
