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Original Communications. 
carbonate of soda have been dissolved ; the mixture is then to 
be filtered and permitted to cool. The kermes preciptiates 
in the form of a heavy powder. The mother water is to be 
decanted and again boiled with the residue. This operation 
is to be repeated several times, and affords an additional quan- 
tity of kermes. This kermes is not to be washed in warm 
water, or it will be decomposed. 
Butter of antimony. — M. Cottereau gives the following as 
the best method of making this caustic preparation: 
Pulverized sulphuret of antimony, is to be treated with the 
hydrochloric acid of commerce, till the latter becomes satu- 
rated. The solution is to be filtered through pounded glass, 
then introduced into a retort, to the beak of which a mat- 
trass is to be attached, and a gentle heat applied by means of 
a reverbatory furnace, until the fluid that comes over begins 
to concrete in the beak of the retort. The recipient is then 
to be changed, and the fire augmented, when the protochlo- 
ride will distil over and concrete in the recipient. To remove 
it, it is to be melted on a sand bath, and poured into small 
bottles with large mouths, and ground glass stoppers. 
R. E. G. 
ART. LIX. — LECTURE INTRODUCTORY TO THE COURSE ON 
MATERIA MEDICA AND PHARMACY IN THE UNIVERSITY OF 
/ PENNSYLVANIA. SESSION. 1835—6. By GeokcxE B. Wood, M. D. 
[In presenting our readers with those parts of Dr. Wood's 
address which have a direct bearing on the subjects to which 
this Journal is specially devoted, we are convinced that they 
will receive both pleasure and instruction from it, and appre 
ciate our desire of giving it that wide circulation its merits so 
decidedly demand.] 
Gentlemen — 
You are aware that I have been chosen to teach Materia 
