804 
Medicine, will be commenced on the 
2d of October, at the Medical Theatre, 
London Hospital. . 
Mr. Wiison will commence .his Lec- 
tures on Anatomy, Physiology, Paiho- 
Jocy, and Surgery, at the Theatre of 
Anatomy,. Great Windmill-street, on 
Monday the 2d of October, at two 
o’clock as usual. A roam is open for 
Practical Anatomy, under the direction 
of Mr. Wilson and Mr. Brodie, where 
demonstrations of the parts. dissect- 
ed, are given daily from one to two 
o’clack. 
At the Theatre of Anatomy, Blenhein- 
street, Great Marlborough-street, Mr. 
Brooxes will commence his autumnal 
course of Lectures on Anatomy, Chy- 
mistry, and Surgery, on Monday the 2d 
ef October, at two o’clock. 
Mr. Tuomas’s Lectures on the Prin- 
ciples and Operations of Surgery, will 
eommence early in. October, as usual. 
A Prospectus may be had at his house, 
Leicester-place, or at the Theatre of 
Anatomy, in Windmill-street. 
Dr. Rerp will reecommence his course 
of Lectures on the Theory and Practice of 
Medicine, on Wednesday the 4th of Oc- 
- eober, at nine o’clock in the morning, at 
his house, Grenviile-street, Brunswick- 
square. The subsequent Lectures will 
be delivered at the same place and hour, 
on every Monday, Wednesday, and Fri- 
day, unul the conclusion of the course. 
Mr. Roserrson will begin bis next 
course of Lectures, on the Principles and 
Practice of Midwifery, and the Diseases 
of Women and Children, at Mr. BeLu’s 
Anatomical Museum, No. 10, Leicester- 
street, Leicester-square, on Friday the 
6th of October, at a quarter past ten in 
the morning. 
Mr. Bropte will commence his Lec- 
tures on the Principles and Practice of 
Surgery, in the beginning of October. 
FRANCE. 
M. Matte Ben, has issned proposals 
for commencing a work, designed to con- 
tain a General Account of the Progress 
of Geographical Discovery. It will ap- 
pear periodically, and consist of a selec- 
tion of the most esteemed contemporary, 
or late voyages, translated from all the 
European langaages, and unpublished 
accounts of voyages, both by natives of 
France, and foreigners. A subordinate 
department will contain a Bulletin of all 
new discoveries, iesearches, or enter- 
prises, which may ténd to accelerate the 
progress of the sciences, particularly of 
Literary and Philosophical Intelligence. 
[Sept. 4, 
Geography. It will be lustrated by 
plates. . 
A few years since, Messrs. Fourcroy 
and VAUQUELIN remarked, that a con- 
crete sugar, or manna, exuded from the 
receptacle of the flowers of the pontic 
dwarf rosebay. (Rhododendron ponti- 
cum). M. Bosc has recently observed 
it afresh, and presented to the National | 
Institute some grains of this substance, © 
collected from the receptacle of the fruit, 
several of which were about 3, of a line 
ix diameter. Their taste and appear- 
ance do not differ. perceptibly from the 
purest sugar-candy ; but it is necessary to 
be upon vur guard against this appear- 
ance, on account of the deleterious pro- 
perties suspected in the plant. This 
manna, according to M. Bose, is dis- 
solved during the night by the moisture 
of the atmosphere, meited in the day by 
the heat of the sun, and does not exnde 
from plants of a vigorous vegetation. 
These are the reasons why it is so seldom 
seen. Piants growing in pots, and shel- 
tered from the dew, as well as from the 
sun, are most likely to furnish it. The 
grains above-mentioned, were collected 
from a plant, in which all these cirgum- 
stances united. 
To the methods that have. been sug- 
gested for improving common alum, by 
freeing it from the iron which it contains, 
M. Secury has addeda new one, founded 
on the. different solubility of pure alum, 
and alam mixed with iron. He dissolves 
sixteen parts of common alum in twenty= 
four of water, crystallizes, and thus ob-_ 
tains fourteen parts of alum, equal to the 
Roman, and two nearly equal to that of 
Liege. This process night be employed 
in the manufacture of alum, so as to ob~ 
tain at first an alum worth one-third more 
than in its impure state. 
The fourth part.of Von HumBotpt’s 
and Bowprann’s Travels, will contain, 
in two quarto volumes, the astronomical 
observations, trigonometrical operations, 
and barometrical measures. Mr. Von 
H. has thought that it would be most sa- 
tisfactory to give the whole of the origi- 
nal observations, that it may be seen 
what degree of confidence the results de~ 
duced from them deserve. The calcula- 
tions have been made by M. Oltmanns, 
from thebest tables. The magnetieal 
observations, with an examination of 
them, and of those of Cook, Vancouver, 
and other able astronomers, by Biot, 
will occupy the second volume. Assuch 
a number of figures must be a consider- 
able. 
