32 
M iscellaneous Notices . 
It is evident that when 
any absorption takes place, 
a portion of air will be ad- 
mitted by the valve, which 
h will bear an internal 
pressure strong enough to 
force out any common ce- 
mented cork. The first 
thus made was in action 
during thirteen hours in the 
mouth of a common bottle, 
used as a retort for the 
production of sulphuretted 
hydrogen, by inserting two 
tubes into the cork, of 
which one was the safety- 
tube just described; it 
therefore ceconomises both 
the retort and the Welter's 
tube for any common use. 
A. bottle. 
satety-tube. c. gas-tube. 
30 tli November , 1829. 
Sir, 
2. On Rising Water by the Mdt. 
To the Edito' ol Gleanings in Science. 
H. P. 
tuSngltX ? f ti T. and i 
ed a method by which it may be avoided I i, ’ ‘ ld ls / heheve * have discovet 
of the kind, I think, can be made ‘ ^ y ° U a , I>lan of the 5ame - Nothin 
farmers of this country. ‘ * 1 or 11101 e simple— two great objects to th 
“ r " 
t your opinion upon it will 
at the P0 fnt 
Kiust traverse round the 
