SC. ae Lectures.’ 
The same electrician once showed meat bis house in’ 
Norwich some jars of very large dimensions, partially. 
cvated on each side with tin-foil in perpendicular stripes of 
about three quarters of an inch in breadth, and the like, 
distance asunder, connected above by. a band of foil passing | 
reund the glass, and at the battom by radu from. the up- 
right stripes meeting m the centre.. He at the same time 
assured wc that he found this mode of coating to produce as 
high a charge, as if the un-foil was jaid on in the usual way. 
If you think this information worthy of insertion in your 
yaluable publication, it is much at your service. 
Lam, sir, your obedient servant, 
Wells, Norfolk, Jan. Mth, 1812. Joun Hrtt.. 
Mr, George Singer has recently discovered a new sy-, 
gem of arrangement for the insulators employed in electri- . 
¢al apparatus, by which their insulation is preserved, with- 
eut the necessity of wiping, through all the vicissitudes of 
aumospherical change. 
An electrometer has been constructed on this principle, 
which has maintained :its insulating power undiminished 
during the last three months, alihough exposed for that, 
time (in a large room without a fire) to the vapour, &c. . 
from various chemical. processes. The security is indeed so 
great, that when the glass cylinder of the electroscope is 
even rendered opague by a coating of precipitated vapour, 
the divergence is not perceptibly iessened. 
A detailed account of this method of insulation, and an 
enumeration of the instruments to which it will apply, will, 
be shortly submitted to the public. 
LECTURES. 
The following Spring Course of Lectures will commence 
the beginning of February. 
At St. Thomas’s Hospital. 
Anatomy and the Operations of Surgery by Mr. Cline, 
and Mr. Astley Cooper. 
Principles and Practice of Surgery, by Mr. Astley Cooper. 
At Guy’s Hospital. 
Practice of Medicine, by Dr. Babington and Dr. Curry. 
—Chemistry, by Dr. Babington, Dr. Marcet, and Mr. Al- 
len.—-Experimental Philosophy, by Mr. Allen.-—Theory of 
Medicine, amd Materia Medica, by Dr. Curry and ‘Dr. 
Cholmeley.—Midwitery, and Diseases of Women and 
Children, by Dr. Haighton.—Physiology, or Laws of the 
Animal GEconomy, by Dr. Haighton.—Structure and 
Diseases of the Teeth, by Mr. Fox. 
Sa 
Our Meteorological Table for January is unavoidably postponed till next: » 
Month, 
