404 
PROFESSOR W. N. HARTLEY ON THE 
Thebaine. From T. and H. Smith and Co. Plate 55, fio-. 5. 
0’1 grm. in 25 cub. centims. of alcohol of sp. gr. 0'8 or 1 in 250. 
Thickness of 
layer of liquid. 
. 
Description of spectrum. 
Wave-lengths. 
millims. 
5 
Continuous, strong to. 
3250 
4 
Continuous, strong to. 
3250 
Faint to. 
3230 
Very faint to. 
3174 
3 
Continuous, strong to. 
3250 
Faint to. 
3174 
2 
Continuous, strong to. 
3250 
Weak to. 
3174 
1 
Continuous, strong to. 
3250 
Rather weak to. 
3174 
Faint to. 
2265* 
A diluted solution of tliis showed an abnormal absorption at one end of the spectrum, 
i.e., 5 millims. dilute should be equivalent to 1 millim. undilute, dilution being 
five times; probably due to a change in the solution from being kept. 
0’1 in 20 cub. centims. of alcohol of sp. gr. 0 8. 
Thickness of 
layer of liquid. 
Description of spectrum. 
Wave-lengths. 
millims. 
5 
Continuous, strong to. 
3238 
Feebly continuous to. 
3215-5 
4 
Continuous, strong to. 
3238 
Feebly continuous to. 
3215-5 
3 
Continuous to. 
3171 
2 
Continuous to. 
3171 
1 
Continuous to. 
3171 
0’1 grm. 20 cub. centims. of alcohol of sp. gr. 0’8, diluted 2 cub. centims. to 
10 cub. centims. =1 in 1000. 
Thickness of 
layer of liquid. 
Description of spectrum. 
Wave lengths. 
millims. 
5 
Continuous, strong to. 
3238 
Weak, continuous to. 
3171 
4 
Continuous to. 
3140 
3 
Continuous to. 
3123-5 
2 
Continuous to. 
3123-5 
Absorption band from. 
3171 to 2568 
1 
Continuous to. 
3171 
Absorption band from. 
3171 to 2568 
Rays transmitted to. 
2568 
* It is remarkable bow the spectrum suddenly lengthens at this point. 
