VARNISHES FROM RESINOUS SUBSTANCES. 
SI 
required time, at least a year, and perhaps many years. If 
-an ounce of such an infusion be mixed with three of water, 
each tablespoonful will contain one-quarter of a drachm of 
spirit which could not do injury, even though repeated every 
two hours. It will, perhaps, answer the purpose better to 
make use of the mixture of spirit and water, for infusing 
the materials, than to use mere water, and afterwards to 
add spirit. In the latter method a precipitation of gelati- 
nous flakes, sometimes considerable in quantity, takes 
place, which very slowly subsides, and constitutes no small 
portion of the total bulk. In the former method, this incon- 
venience is in a great measure avoided, although there is a 
trifling loss of spirit. The residuum in each case should be 
submitted to the screw press. Such concentrated infusions 
would in all probability become articles of manufacture 
with the large druggists and manufacturing chemists ; and 
thus would the apothecary be relieved of a vast deal of un- 
availing trouble. — Jimer. Journ. Med. Sciences, from Dub 
lin Medical Press, December 20, 1S48. 
ART. XXIV. — PATENT GRANTED TO JAMES CASTLEY FOR 
IMPROVEMENTS IN THE MANUFACTURE OF VARNISHES 
FROM RESINOUS SUBSTANCES. 
The first part of this invention consists in manufacturing 
a strongly adhesive and perfectly water-repellent varnish 
from resin spirit and gutta percha. 
3 parts by weight of the gutta percha of commerce are 
put into a pot with 9 parts of crude resin spirit (obtained 
by the destructive distillation of common resin,) and subject- 
ed to a heat of from 120° to 140° F., the mixture being 
stirred occasionally until the gutta percha is dissolved. 
The varnish thus produced is suitable for coating coarse 
fabrics, such as tarpaulins, rick-cloths, &c. : but to obtain a 
varnish suitable for fine aricles, the patentee substitutes for 
