M’CLUNG: REFRACTIVE INDEX AND ALCOHOL-SOLVENT POWER. 199 
4 Stre 
Refractive of Ateohol Pace usr 
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cmaweet Birch) 27.1 .53920: -24,-1° 90 #2 
‘¢ Cinnamon leaves....1.53535 -+-- 85 és 
SALe(SOUPG.T.1OS eo.) 1.53594 92. 6 OS . Pant arn oe 
CPC IMER Lh. iS dicewal: 5300522022 QOS re NS The 
Mr LON CSS oO I) nein &- AZZ Yoke, BO 8 Paid OL, 
Mvirbane fo: 3 50,07 54082" 2. 95 1: nL My 
Oe Meee tener. 25 entY YG ZOG lon 5. QS Bs ee 
ENON i we orale oa is 5 F200.” 2 se<e*) GO FE 
Mae ig ee, ne Te AST. ae BO sf AS a a 
Bi Asdseta st S1.90,)..2 22.1 DOLD0 » 54 .%. 80 be BERND ee! 
The table speaks for itself, so that comment is scarcely neces- 
sary. From the list given, a series of clearing agents may be 
selected in which almost any refractive index from 1.44 up to 1.60 
is obtainable. Since many of these are suitable agents in which 
to mount objects, the proper refractive power for most structures 
may be selected. Where it could be found, the price of the 
reagent per pound is given. : 
Particular attention is called to the value of the oil of cassia, 
which has a refractive index of 1.60160 and clears from 80 per cent. 
alcohol. it is a most excellent reagent according to all experience 
in the laboratory, and in addition to its other good qualities it 
dries hard enough to make permanent mounts. 
