Retro[pe& of German Literature. 
thered from his title-page. They are un- 
folded with confiderable ingenuity in this 
introductory part of his fyftem. 
MATHEMATICS AND ASTRONOMY. 
Effai fur la Theorie des Nombres, &c. An 
Effay on the Theory of Numbers, by A. 
M. Le Genpre, of the National Infti- 
tute; 4to. with very extenfive tables 
De la Refolution des Equations numeriques, 
@c. On the Refolution of numerical 
Equations of all Degrees; by J. L. La- 
GRANGE, of the National Inftitute, to. 
Both the above are works of reputation. 
Lecons Elementaires, &c. Elementary 
Leflons of Arithmetic and Algebra; by 
P. TEDENAT, Affociate of the National 
Inftiture. Without any pretenfions to 
novelty, this is an ufeful elementary work, 
On account of Irs clearnefs of method. 
Moyens d’apprendue, Sc. Method of 
learning to reckon with Accuracy and Fa- 
cility ; a pofthumous work of Condorcet. 
z2mo.-This work is faid to unite the ele- 
ments of arithmetic with thofe of logic. 
Introdzftion al Algebre, Sc. Introduc- 
tion to Algebra; containing among other 
Things, an Arithmetic of direét or pofitive, 
and of inverfe or negative Quantities ; by 
Emo. DEVELEY, profeffor of mathematics 
at Laufanne. The work of a promifing 
young mathematician, who feems defirous 
of giving new views of his fubjeét. 
Traité des Montres & Longitudes, Sc. A 
Treatife on Longitude-wartches or Time- 
pieces, containing al! the Details of their 
Conftruétion, the Mode of trying them, 
&c. to which are added, a Memoir on the 
working of Clocks and Time-pieces, the 
Defcription of two aftronomical Clocks, 
and an Effay on a Method of preferving 
the Relation of Weights and Meafures, 
and eftablifhing an univerfal and perpetual 
Meafure; by Ferp. BErTHOUD, me- 
chanician to the navy, 4to, with plates. 
A fecond volume of this work is printed, 
but not yet publifhed. It is a perfurmance 
of great value, and has obtained the ap- 
probation of that eminent aftronomer, La- 
lande. 
Ménoire contenant, Sc. Memoir con- 
taining theoretical Explanations of a Tri- 
553 
gonometric Chart, ferving to reduce the 
apparent Diftance between the Moon and 
the Sun or another Star, to a true Dif- 
tance, and to refolve other Queftions of 
Navigation; by MAINGON, lieutenant of 
aveffel, 4to. This is mentioned by La- 
lande as an ingenious, eafy, and exact me- 
thod of reducing diftances by rule and 
compafs with a fingle chart. 
Traité de P Infiallation, &c. Treatife on 
the Inftallation of Veffels, by Cit. Bur- 
GuEs Misstepi, Rear-admiral. Printed 
by order of Government, 4to. with many 
plates. By the word z2/fallation, the au- 
thor means that difpofition of moveable 
and immoveable articles in a fhip which 
may beft fecure the fteadinefs and regula- 
rity of its motions, and prove moft com- 
modious in failing and time of aétion. 
‘The difcuffion of this fubjeét has led him 
into many delicate and curious calcula- 
tions, which render his work truly {cien- 
tific. 
MIscELLANIES. 
La Mythologie mife 4 la portée de tout le 
Monde. Mythology rendered univerfally 
intelligible, ornamented with 100 Figures, 
coloured, or in black and white, drawn and 
engraved by the ableft Artifts in Paris; an 
elementary Work, indifpenfable to young 
Perfons of both Sexes, and ufeful to all 
Readers. A new Edition, printed by Dr- 
por the Younger, 12 vols, r8vo, Though 
this is entitled a new edition, the plates 
only are old, but the text ts quite new. 
This work may be regarded as the firft 
complete elementary treatife of mythology, 
all others having rather been particular 
fyftems or interpretations of mythology. 
It is very carefully printed, and agreeably 
joins inftruétion with amufement. 
Recherches Hiftoriques, @e. Hittorical, 
literary, and critical [Inquiries concerning 
the Origin of Printing, partictlarly its 
fir Eftablifhments in the 15th Century 
in Belgium; adorned with the Portraits and 
Devices of the firft Belgic Printers; by 
Cit. LAMBINET, 8vo. This curious work 
is the fruit of much refearch, aided by 
particular opportunities of information in 
the Low Countries. 

Half-yearly Retrofpett of German Literature. 
HE great variety of valuable publica- 
tions which of late have appeared in 
Germany, and the limits of our magazine, 
will not permit us, this time, to mention 
much more than the titles of many works 
which deferve a more ample notice, and 
seduces us to the unpleafant neceliity of 
giving only a fuccinét account of a yet 
greater number, which merit a more cir- 
cumftantial review. However, we flatter 
ourfelves that our readers will do us the 
juftice to believe, that no confideration 
whatever will induce us to withhold any 
iinportant information which we can give 
conliftcarly 
