280 
Harriuy—The Action of Heat on the Absorption Spectra and 
A 
Chromium Nitrate (uncrystallizable).— At 20° Spectrum begins at 673 
Solution diluted, being otherwise too Rays transmitted to 588 
opaque. Absorption Band, 588 to 557 
Spectrum ends at | 481 | 
At 100° Spectrum begins at 673 
Rays transmitted to | 588 
Absorption Band, 588 to 557 
Spectrum ends at 481 
Violet Chromium Nitrate.-—0°5 gr. dis- At 16° Spectrum begins at 673 
solved in 4 c.c. of water. Rays transmitted to 565 
Absorption Band, | 565 to 507 
Spectrum ends at 462 
At 100° Spectrum begins at 667 
Rays transmitted to 565 
Absorption Band, 565 to 507 
Spectrum ends at 462 
0°5 gr. heated to 100°, dissolved in cold At 18° Spectrum begins at 667 
water, and made up to 4 c.c. Absorption Band, | 627 to 507 
Rays transmitted to 438 
Chrome Alum, KCr(SO,).°12H,0. At 37° Spectrum begins at | 685 
Rays transmitted uninterr uptedly 
to : 0 a | 470 
At 100° Spectrum begins at 685 
Absorption Band, 627 to 543 
Rays transmitted to where spec- 
trum ends, 508 
When hot the liquid i is nearly 
opaque. 
Chromium Oxalate.—A solution of the _ At 20° Spectrum begins at 719 
violet-grey chromium hydroxide in | Absorption Band, | 706 to 685 
oxalic acid. At 100° Spectrum begins at | 719 
Absorption Band} begins at 711 
Nothing visible beyond. 
A similar solution, No. 3. At 18° Spectrum begins at 719 
Absorption Band, 704 to 689 
Blue Potassium Chromoxalate, At 20° Rays visible at 673 
K,Cr,(C,0,).°6H,O.—Thin wedge-cell. Absorption Band, 627 to 497 
Lamp-light. Readings made with Rays transmitted to 481 
great difficulty. Solution nearly At 100° Rays transmitted at 673 
opaque when hot. Absorption Band, 631 to 503 
Rays transmitted to 481 
Red Potassium Chromoxalate, At 20° Spectrum shaded to 710 
K,Cr,(C,0,),°10H,O.— Thin wedge- Rays transmitted to 694 
cell. Lamp-light. (1) Narrow black band at 694 
2 nat 685 
| Absorption "Band, 6338 to 478 
End of spectrum, 464 
At 100° Spectrum continuous at . 673 
Absorption Band, 588 to 537 
Spectrum continuous to . 464 
