158 Scientific Intelligence. (Fes. 
of navigators at that period. A third observation will perhaps be 
found, which, though not very precise, will be sufficient at least to 
reduce the uncertainty within much narrower limits; an uncer- 
tainty which is to be apprehended from two observations separated 
from each other only by an interval of two days. 
ARTICLE XIV. 
SCIENTIFIC INTELLIGENCE; AND NOTICES OF SUBJECTS 
CONNECTED WITH SCIENCE, 
I. Lectures. 
Dr. Merriman’s Lectures on Midwifery, at the Middlesex Hos- 
pital, will recommence on Thursday, Feb. 8, at half past 10 o’Clock. 
Medical School of St. Thomas’s and Guy's Hospitals —The 
Spring Courses of Lectures at these adjoining Hospitals will com- 
mence the beginning of February, viz.: 
At St. Thomas’s.—Anatomy and the Operations of Surgery ; by 
Mr. Astley Cooper and Mr. Henry Cline.—Principles and Practice 
of Surgery; by Mr. Astley Cooper and Mr. Henry Cline. 
At Guy’s.—Practice of Medicine; by Dr. Babington and Dr. 
Curry.—Chemistry; by Dr. Babington, Dr. Marcet, and Mr. 
Allen.—Experimental Philosophy; by Mr. Allen.—Theory of Me- 
dicine, and Materia Medica; by Dr. Curry and Dr. Cholmeley — 
Midwifery, and Diseases of Women and Children; by Dr. Haigh- 
ton.—Physiology, or Laws of the Animal Economy; by Dr. 
Haighton.—Structure and Diseases of the ‘Teeth ; by Mr. Fox. 
N. B. These several lectures are so arranged, that no two of them 
interfere in the hours of attendance; and the whole is calculated to 
form a complete Course of Medical and Chirurgical Instruction. 
Russell Institution.—A Course of Lectures on Electrical Philo- 
sophy, with its application to the improvement of Chemical 
Science, and the explanation of Natural Phenomena, will be com- 
menced at this Institution by Mr. Singer, on Monday, Feb. 5, 
at eight o’clock in the evening. 
These Lectures will be continued on the succeeding Mondays at 
the same hour. They will embrace the most important features of 
this interesting branch of Natural Philosophy, with occasional ob- 
servations on the Sciences with which it is most immediately con- 
nected. 
II. Coal Gas. 
The Coal Gas Company in’ London have lately very much in- 
creased the gaseous product yielded by coal, by distilling a second 
time the tar which is obtained during the first distillation. This 
second product of gas they consider as purer and better than 
the first product, Many years ago I made various experiments on 
