tn 
Pind > " = 7.2 
se pelea es 265 
the amount of nitrogen and the known composition of these principles 
as made out by Milder, Scheerer and others. . 
_. The following is the statement of the nutritive value of some of th 
_ substances alluded to in the extensive table accompanying the memoir. 
Wheat is taken as the standard, and the numbers in the table represent 
‘how many ‘parts of the corresponding vegetable are equal to 100 of 
“Wheat, 
: ‘Theory. “by Bonssingault, 
Dried at 212° F./ Fresh. . Fresh. 
- 100° |100- 94° ¢ 
é 98'8 97:6 97-6 
é 115- 113° 108 
220° 225° 
: 170: 166° 1227 
57° 60° 90°7 
‘ 55° 58° 
‘ ‘ . | 220° 5963 429- 
Ree eee 1827 919-4) 589.7 
a ee | | ILLS. 
4A Description of a new Mercurial Trough; by Prof. Louver, 
(Phil. Mag., May, 1846.)—It consists of a small oblong oak-box, 1} 
Inches in depth, nine inches in length, and six inches in breadth. To 
the bottom is cemented a plate of glass exactly covering its whole ex- 
tent; this glass has a small piece cut out of the middle of one of its 
shorter "Sides, either of a rectangular or V shape, extending about an 
inch and a half from the ‘margin; the upper surface of the glass is 
~~ ground ‘perfectly level. The side of the box next to which comes the 
edge with the piece taken out, has a groove cut in it from the top to 
- the bottom, terminating in an excavation in the bottom of the box; just 
°ver which the rectangular opening in the glass comes; so that a bent 
‘tube coming from a vessel in which gas is being generated, may have 
‘lls lower extremity placed beneath the floor of the trough. The re-. 
Celvers used are tubulated, having the lower edges well ground. To 
 flhthe receivers, the lower edge is placed upon the bottom of the 
trough, it being ious! eased if thought necessary, the stopper 
. previously greased if th 
Withdrawn, and then it is entirely filled with mercury and restopped. 
Asmall quantity of mercury is next poured into the box, so as to fill 
ie Stall cavity, and cover the bottom for about the tenth of an inch; 
Sad 
the Teceiver can now be moved in all directions, and placed over the 
: cavity into which the extremity of the curved tube from which the gas 
A disengaged, is placed. The advantage of this species of trough is 
“at with a small amount of mercury, large receivers may 7 eye 
