512 
PROFESSOR W. N. HARTLEY OH THE 
Digitaline. From T. and H. Smith and Co. 
O'l grm. in 25 cub. centims. of alcohol of sp. gr. 0 - 8. 
Thickness of 
layer of liquid. 
Description of spectrum. 
Wave-lengths. 
millims. 
5 
Continuous, strong to. 
3610 
Very faint to. 
3465 
Exceedingly faint to. 
3033 
4 
Continuous, strong to. 
3610 
W eak to. 
3465 
Faint to. 
2572 
3 
Continuous, strong to. 
3465 
Weak to. 
2980 
Faint to. 
2572 
2 
Continuous, fairly strong to ... 
2837 
Fairly strong to. 
2572 
Faint to. 
2422 
1 
Continuous, strong, but not of normal 
strength to. 
2545 
Weak to. 
2313 
Thicker layers of liquid, namely, 10 millims., 15 millims., and 20 millims., were 
examined, but the absorption was continuous and increased down to transmission of 
rays at 75. 
Picrotoxine. From T. and H. Smith and Co. 
O'l 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. 
2398 
Very weak to. 
2261 
4 
The same increasing in strength. 
3 
The same. 
2 
Continuous and fairly strong .... 
2261 
1 
Continuous and strong. 
2261 
20 
Continuous, strong to. 
2521 
10 
Continuous, strong to. 
2500 
Weak to. 
2418 
This substance shows no absorption band. 
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