Part I.] Puran Singh: Turpentine Oil and Indian Rosin. 31 
last, I have now tlie honour id intimate to you the temperatures of 
distillation. 
“ ‘ A ’ commenced to boil at 158° C. ; the distillation was stopped 
at 172° C. when 88 per cent, had passed over. 
“ ‘ B 5 commenced to boil at 162° C.; it was stopped at 106° C. 
when 98 per cent, was found to have distilled over. 
“ 1 C ’ commenced to boil at 158° C-; it was stopped at 169° C. 
when 94 per cent, had distilled over. 
“ The atmospheric pressure whilst working varied from 29*7 to 
29*9 inches. The effect of a reduction of pressure of two inches was 
found to vary from 3° to 4°, and was the same for all the three 
samples. You will see from a comparison of these data with those 
which you mentioned in your letter, that the difference of elevation 
between here and Dehra Dun accounts for practically the whole of 
the difference between the observed temperatures.” 
Therefore, the variance between the figures of the writer and 
those recorded by the Reporter on Economic Products to the Govern¬ 
ment of India is partly due to the difference in the conditions of 
fractional distillation and partly to the variations in the quality of 
the spirit distilled oil, which was only experimentally produced at 
Bhowali, little care being taken to produce a large sample of 
uniform quality. 
The Superintendent, Assam-Bengal Railway, Pahartali, writing 
to Mr. Smythies, expresses the following opinion about the spirit 
distilled oil: — 
“ I have the honour to inform you that I have had the sample 
of turpentine supplied by your Forest Ranger tested, 
and the Locomotive Superintendent of this Railway 
reports that it is of good quality, but the difference in 
freight from the station of delivery to Chittagong on 
the turpentine obtained from Calcutta at Rs. 2-12 per 
gallon and that offered by your Department at Kathgo- 
dam at Rs. 2-8 per gallon makes the latter compara¬ 
tively costly, and I am, therefore, unable to adopt it 
for use on this Railway.” 
The samples A (being oil slowly distilled with spirit) and B (being 
oil rapidly distilled with spirit) were sent by the Divisional Forest 
[ 31 ] 
