376 
ers of the bear, have no other enve- 
lope. : 
_ The fame able anatomift is about to 
publifh an important work on the eye, and 
the difeafes to which it is fubjett. He 
has made feveral new remarks upon the 
parts which furround this organ: he has 
Yound fome tendinous lumps which tie the 
firaight mufcles to the anterior edges of 
the orbit, and ferve them for a kind of re- 
turnmg pulley, and hinder them from 
comprefiing the eye-ball: he has deve- 
loped a membranous tunic which fur- 
rounds the eye-ball, attaches it to the two 
angles of the orbit by two kinds of wings, 
paties into the pupils, and is there re- 
flected behind the tarfi, and gives a pal- 
fage to the tendons of the mufcles: he 
has eitablithed a new opinion upon the 
agents which tranfmit to the iris the ac-: 
tion of the ¥etina, and by which the im- 
preilions received by the latter dilate or 
contract the other, thefe agents he finds 
in the ciliary proceffes, the tongues of 
which are prolonged behind the iris, and 
the tails of them touch the retina. 
M. Tenon has alfo difcovered' that the 
hare-lip fometimes proceeds from arent of 
of the maxillary bones, fometimes from 
a rent in both; and he attributes the 
caufe of it to a difproportionate: dilata- 
tion of the tongue. He aflerts that it is 
highly dangerous to perform any opera- 
tion for the hare-lip at the time when the 
teeth are cutting. 7 
M. Duvernoy, a young pbyfician, has 
refented to the National Infutute a Me- 
moir upon the Hymen, in which he has 
fhown that this imgular membrane, hi- 
therto generally regarded as peculiar to 
the human fpecies, is alfo found in every 
animal. 
M. Bartuey, profeffor of Montpelier, 
has re-written his celebrated work upon 
the Elements of the Science of Man, 
which it is expeéted will produce a kind 
of revolution in the fcience of phyfio- 
logy. 
M. Ducom has given a new method of 
determining the latitute at fea by two al- 
titudes. It is founded upon this princi- 
ple, that the time which we deduce from . 
an obfervation made at the moment the 
fun paffes by the prime vertical is exact, 
whatever may be the error which affects 
the latitude by account, which 1s requifite 
to be ufed in moft of the methods now 
followed. By this firft obfervation, and 
the exaét time to be deduced from it, the 
Literary and Philofophicat Intelligence. 
[May 1, 
watch is regulated; and af any other 
time of the day a néw altitude, with this 
exact time beig known by the preceding 
operation, ‘will give the -true’ latitude. 
Commitfioners have been appointed to 
examine this method, who report that it 
will give the latitudé very exaétly, what- 
ever may be the error in the latitude by 
account, when, as the method requires, 
one of the two altitudes thali have been 
taken exatily at the paflage by the prime 
vertical, or very near it. ace 
M,Lervroup has Jately read to the So- 
ciety of Arts and Sciences,at Bourdcaux, 
a Memoir upon the Generation of Sur-: 
faces of the Second Cider. All of them 
may refult from one common generation, 
which is executed by acurve of the fe- 
‘cond kind variable in its dimenfions, and 
moved in fuch a manner that its plane 
may always remain parallel to itfelf, 
The equations which point’ out this cir- 
cumitance give the law of the motion of 
the géeneratrix. This’ curve ‘will be an 
elliplis for furfaces having a céntre, and 
a parabola for furfaces having Ro centre. 
Tn the cafe where each of the points of 
the generating curve has a right line for 
its direction, the furface may be engen- 
dered by a firaight line’ moved in {pace. 
The analytical condition for this to hap- 
pen indicates the hyperbolic paraboloid, 
and the parabolic cylinder. The com- 
mon generatrix to all thefe furfaces may 
become a circle, except with regard to 
the two laft: , i sp be 
A magnificent work is announced at 
Paris by Mefirs. Trrotren and WuRvz, © 
under the title of Voyage Pittorefque de 
Conttantinople et des Rives du Bofphore, 
which is to contain forty-eight plates, and 
to be publithed im twelve parts, accom- 
panied by fuitable texts; prmted by Didot. 
The price of each print will be 100 
francs to the fubfcribers at Paris, and the 
firft part is to appear in May. 
America. 
Mr. F. D. Burk has recently publith- 
ed two volumes of the Hiftory of ‘Virgi- 
nia, which will fpeedily be followed by a . 
third and fourth. We_underftand that 
this Hiftory of Virginia is not only valu- 
able as the produétion of a fuperior pen, 
but alfo from the new information with 
which it abounds, every diftinguifhed cha- 
racter of the Union, particularly'the pre- 
fident Jefferfon, having contributed ma- 
nulcripts to the hiftorian. 
MONTHLY. 
