466 Royal Society :— T toy 
Oil of Spikenard.— Powell. 
ie 
Ray. Difference, 
Observation. Theory. 
B 1-4732 
Cc 1°4746 1*4744 —°0002 
D 1:4783 1°4082 —-‘0001 
E 14829 14826 —*0003 
F 1°4868 
G 1:4944 1°4945 +:0001 
H 1°5009 
Benzole.—Powell. 
B 1°4895 
Cc 1:4961 14907 —'0054 
D 1°4978 1°4965 —:0013 
B 1:5041 1°5029 —°0012 
F 1:5093 
G 1°5206 1:5210 +0004 
H 1°5310 
In oil of lavender and of sandal-wood there was some indistinet- 
ness in the line H which renders its index a little uncertain. It may 
be owing to this circumstance that the assumption of that index may 
have occasioned the discrepancy between theory and observation, 
In oil of spikenard the accordance is good. In benzole the discre- 
pancies are too great. 
Bisulphide of Carbon.—Dale and Gladstone. 
Ray. ik i nl eg Difference. 
Observation. Theory. 
B 1°6177 
C 1:6209 1°6169 —°0040 
D 1:6303 1°6251 —*0052 
1D 1:6434 1°6425 —‘0009 
FE 1°6554 
G 1:6799 16807 +°0108 
H 1°7035 
Phosphorus dissolved in Bisulphide of Carbon. — 
Dale and Gladstone. 
B 19314 
CY eum aie 1°9298 
D 1°9527 1:9522 —*0005 
E 1°9744 1°9726 —'0018 
F 1:9941 
G 2°0361 2°0363 +:0002 
H 2°0746 
