Chemistry and Physics. 131 
cup, with a diameter of about half an inch, water was heaped to a 
height of 176 inches. The edge of No, 4 was rubbed with tallow ; 
water at a temperature of 75° F. was then heaped to a height of 
‘182 inches. Judging from these results, it seems that the height 
to which a liquid may be heaped depends upon the nature and 
SCIENTIFIC INTELLIGENCE. 
I. CHEMISTRY AND PuHysics. : 
and the same gas is capable of giving different spectra. In the 
case of nitrogen, Secchi obtained with same tube three differ- 
ent spectra, Schuster, in repeating this experiment, obta nly 
r, and this proved to be the case. To eliminate oxygen com- 
pletely from the tube, Schuster heated small pieces of sodium in 
© gas. After this treatment, the line spectrum only could be 
obtained. The author measured the wave-lengths of the cannel- 
lated bands as well as those of the nitrogen lines, with the follow- 
ing results: 
Bands. 
512°9 455°6 431°8 
498°1 443°6 423°7 
464°9 439°0 
Nitrogen lines. 
628°8 566°6 418°4 
616°5 516° 
615°2 489°4 
594°2 464°4 
593°2 421°4 
The true s ‘ : ized by an intense 
ue spectrum of nitrogen is characterize ry , | 
Steen line. Toward the er there is a green, not shaded, band, 
and there are also a few unshaded violet lines. Pure nitrogen 
exhibited only one spectrum, whatever might be the pressure. 
