498 
PROFESSOR W. N. HARTLEY ON THE 
0‘2 dissolved in 200 cub. centims. of alcohol of sp. gr. 0‘8, 2 cub. centims. diluted to 
10 = 1 in 5000. 
Thickness of 
layer of liquid. 
Description of spectrum. 
Wave-lengths. 
millims. 
5 
Strong, continuous to. 
3245-5 
Weakening of the spectrum between . 
3245-5 and 2863 
Continuous to. 
2482-5 
4 
Continuous to. 
2418 
3 
Continuous to. 
2418 
2 
Continuous to. 
2310 
1 
Continuous to. 
2259 
Narceine. From T. and H. Smith and Co. 
0'1 grm. in 25 cub. centims. or 20 cub. centims. of alcohol of sp. gr. 0‘8, with 
5 cub. centims. of glacial acetic acid added thereto. 
Thickness of 
layer of liquid. 
Description of spectrum. 
Wave-leDgths. 
millims. 
5 
Continuous, strong to. 
3572 
Weak to. 
3465 
4 
Continuous, strong to. 
3465 
Weak to. 
3330 
3 
Continuous to. 
3330 
Faint to . . 
3276 
2 
Continuous to. 
3260 
1 
Continuous, strong to 119. 
3260 
O'l grm. in 25 cub. centims. of alcohol of sp. gr. 0'8. Solution kept some time. 
Thickness of 
layer of liquid. 
Description of spectrum. 
Wave-lengths. 
millims. 
5 
Faint, continuous to. 
4237 
Feebly continuous to. 
4041 
4 
Weak, continuous to. 
4041 
Faint, continuous to ...... 
3982 
3 
Same as last. 
2 
Fairly strong, continuous to ... 
3982 
Feebly continuous to. 
3600 
l 
Fairly strong, continuous to . 
3982 
Faint to. 
3456 
