232 H. Goadby on making wet P? op ye of A? tO «Sos 
sary to use sweet oil, and any of the above named substances 
(L-use all of them) will speedily cut a hole through the glass. 
Superfine emery in addition to oil may be used, but I believe 
that it cuts the drill without expediting the process. 
For large vessels, I have been in the habit of giving increased 
strength to all the joints by covering them on the outside with 
a frame of glass consisting of strips about one-fourth of an inch 
wide ; and, as the top glass is included in this arrangement, the 
corks plugged into the drilled holes are thereby kept in their 
place and concealed. 
Lastly, 1 have made.such preparations ornamental by water 
ilding the outer frame or moulding. This last process tries the 
joints severely ; for the gilder’s cement which must be applied to 
the moulding, contracts as it dries, and when dry is unyielding. 
As it is contrary to all theory that a vessel filled with fluid and 
hermetically sealed, should endure the ever varying alternations 
of temperature without change—neither affected by the summer 
heat nor winter’s cold—it is desirable to give my experience in 
relation to this subject. I have in my possession preparations 
sealed originally without a bubble of air; one of these, the vesse 
being 9 inches by 11, half an inch deep, was made in Edinburgh 
in 1841, and framed as a picture—to this time it has not @ 
bubble of air. sgt 
Some dissections of Terebratula australis—mounted seven 
years ago, are as perfect now as they were when first completed. 
These and other preparations, have travelled extensively in Eng- 
land, have crossed the Atlantic where they were well tossed about 
for two weeks out of seven, and they still accompany me in my 
wanderings in this country. They endured with impunity the 
capricious temperature of England, and here they have been sub- 
ject t own to 8°—still without change, while other prepa 
rations, side by side with the former, about which as much cafe 
had been bestowed have miserably failed—why is this? 
In some instances one can readily perceive that the cause of 
