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Experiments on Tar-Water , I think it will be a 
Means of making it a more ufeful Medicine: I am 
fure it will prevent its doing the Mifchief I hear it 
has done in fome Cafes. For, till the feveraf pecu- 
liar Diforders, in which Tar-Water may be ufefu!, 
are found out, the Taking it at random, in fuch large 
Quantities, mull oftentimes do Hurt. 
In Return for your Favour, I have fent inclofed a 
Scheme, which I have a great while thought of, for 
the Improvement of Diftillation in the chemical Way. 
I flatter myfelf, it will be very advantageous in pro- 
curing many fine volatile Things, which we cannot 
fo well do in the ordinary Method ; and that we may 
be enabled by it to analyfe fome Things, as Blood, 
and fuch-like Subftances, without breaking ourGlafies; 
as the learned Boerhaave complain'd he could not do, 
by reafon of a pitchy bituminous Matter riling up into 
the Neck of the Retort, and burfting it. But, in fhort, 
I have found, from many Experiments, That it is 
the vafl Quantity of Air, arifing from fuch Subftances, 
which burfts the Glafles, and which this Method will 
prevent. 
However, I beg the Favour of you to confider it ; 
and to give me your free Thoughts, whether it will 
be worth while to lay it before the Society , in order 
to communicate it to the World. Your Anfwer will 
infinitely oblige, 
T>ear Sir , 
Fetersfield , Jan. 10 . 
1744. 
Tour moft obedient Servant , 
B. Langrifh. 
