48 
Indian Forest Record *. 
[Yol.-IY. 
In tliis case, tlie loss calculated is only about 6 per cent. 
Redistilled oil with its 
fractions mixed uy excluding the last 
nine bottles 
155°—160° C. . 
160°—165° C. 
165°—172° C. . 
Residue above 172° C. 
45-0 per cent. 
320 
11-0 
12-0 
9) 
99 
The loss calculated in this case is about 11 per cent. 
From the above table it will be seen that the redistilled oil, when 
the last portion of the distillate is not included, gives about 80 per 
cent, below 172° C., which nearly equals the quality of Z with the 
difference that the loss entailed in the distillation of the whole 
quantity is 11 per cent., while redistilling D alone the loss is 
only about 6’5 per cent. But this operation of redistillation of 
A + B + C + D was done in the still used for the distillation of crude 
turpentine, which was coated inside with a layer of colophony, and, 
therefore, these results are probably wanting in accuracy, as the 
presence of colophony in the still must have probabfy allowed the 
heavier portions of the oil to distil over and mix with the distillate. 
These results were apparently inaccurate because redistillation of 
all the fractions mixed together must give a better oil than Z in 
whose case only a portion of the whole was redistilled. Before 
saying, therefore, that from a practical commercial point of view 
it would be unnecessary to redistil the whole quantity when the 
redistillation of a small portion of the oil would give the same 
quality of the refined oil, it was thought necessary to see if the 
. -redistillation of A+B+C+D in a perfectly new still would give 
much better results than when only D is redistilled. Accordingly 
a quantity of A + B + C + D was redistilled in a new still and the 
redistilled oil was fractionated with the following results : —* 
Re distillation of A + 5 + C + Z) in a new still. 
155°—165° l C. . 
165°—172° C. 
Residue above 172° C.. 
80-Cfper cent. 
15-cT „ 
t 48 ] 
