298 Miscellaneous Intelligence. 
already given, we get 4180 millions of cubic feet of clay under our streets 
and houses, in which securely lies 126 millions of dollars. And if, as is 
a cellar, enough gold goes with it to pay for the carting. And} 
bricks which front our houses could have brought to their surface, 1m the 
form of gold-leaf, the amount of gold which they contain, we should 
have the glittering show of two square inches on every brick—Am 
iety Proceed., viii, 273. 
4, Notice of Chemical and Physical Apparatus, by Becker & Sons.— 
The Sheffield [Yale] Scientific School has recently procured from Becker 
& Sons, 54 Columbia st., Brooklyn, N. Y., some instruments of such 
excellent device and workmanship that we deem it a duty to the scientific 
community to call attention to them. 1st, An air-pump for laboratory 
use. This has a single cylinder, the piston of which is solid and has a 
diameter of 34 inches and a seven inch stroke. The communication 
tween the. interior of the cylinder and the receiver is opened and 
closed by means of a two-way cock which is operated by the motion of 
the pump-handle. The instrument is compact, light, of simple construc- 
tion but most accurate workanship, and from the absence of valves ' 
always ready to furnish a good vacuum with a few minutes labor. 
serves also as a condenser, and is adapted for transferring gases. I tt 
the best instrument we have’ ever seen for the chemical laboratory. t 
$100. : 
2d. The Balances of Becker & Son, we are also prepared, after oo 
of 
zo of a milligramme, an Analytical Balance carrying 200 grms. in “er 
pan niger Steere J zoth miligramime and a Physical a bd 
tisement. no oh Sh alta 
8d, A standard and mountain siphon Barometer with inch shal os 
meter graduations belonging to the Laboratory is a very beaut 
precise instrument. ; 
cies eee 
