The Sun.
London, England, 1834-11-27 00:00:00

PROFESSOR YOUNG'S WORKS

- -
ON THE MATHEMATICS, NAVIGATION, MENSURA-
TION, GEOMETRY, TRIGONOMETRY, &c.
Published by J. SOUTER, School Library, 73, St. Pail's Church-
yard, London ; and sold by most respectable Booksellers.
ANALYTICAL COURSE of MATHEMA-
TICS;
By J. R. YOUNG, Professor of Mathematics in Belfast College.
ELEMENTS of GEOMETRY : containing a New and Univer-
sal Treatise on the Doctrine of Proportion ; together with Notes'
in which are pointed out and corrected several important Errors
that have hitherto remained unnoticed in the Writings of Geo-

meters. Bvo. Bs.
*,s," The following brief notices have been selected from various
Criticisms too numerous for insertion here, all speaking of Mr.
Young's Works in high terms of approbation :
" Mr. Young's Observations on the theory of parallel lines, the
labour he has bestowed on the doctrine of Proportion, as well as
his corrections of many errors of preceding geometers, and supply-
ing their defects,• together with his minute attention to accuracy
throughout, may be justly considered as rendering his performance
valuable, especially to the learner."—Philosophical Magazine.
" In perspicuity, Euclid has no rival, except, perhaps, in that
part of his work which treats of Geometrical Proportion. This is
abstruse, and subtle, and intricate. The doctrine of proportion,
as connected with geometry, must necessarily be so. Hence Le-
gendre has excluded the consideration of it from his Elements,
leaving all knowledge of the subject to be acquired from numerical
proportion. This is a defect which Mr. Young has ably supplied.
Indeed, we have never seen a work so free from pretension, and of
such great merit. Various fallacies latent in the reasonings of
some celebrated mathematicians, both of ancient and modern date,
aro pointed out and discussed in a tone of calm moderation, which,
we regret to say, is not always employed in the scientific world."—
Monthly Magazine.
" Mr. J. R. Young, who has distinguished himself as the author
of a useful elementary treatise on Algebra, has just published a
work of the same beneficial description, ' Elements of Geometry,'
with Notee. The great advantage which students will derive from
this work is, that the converse of every geometrical proposition
(where demonstration is possible) is given. This has never been
systematically done before. Several other improvements are intro-
duced (especially with regard to the doctrine of Proportion), and
many errors of former geometers corrected."—Sunday Times.
AN ELEMENTARY TREATISE on ALGEBRA; Theoretical
and Practical ; with Attempts to simplify some of the more diffi-
cult Parts of the Science, particularly the Demonstration of the
Binomial Theorem, in its most general form ; the Solution of
Equations of the higher Orders ; the Summation of Infinite Se-
ries, &c. A now Edition, greatly improved, in one vol., duode-
cimo. Price ss. 6d.
+s
s,* " A new and ingenious general method of solving Equa-
tions has been recently discovered by Messrs. 11. Atkinson, Hol-
dred, and Horner, independently of each other. For the best prac-
tical view of this new method and its applications, consult the Ele-
' mentary Treatise 6n Algebra, by Mr. J. 11. Young, a work which
deserves our cordial recommendation."—Dr. Gregory's Edition of
Hutton's Mathematics, vol. I, p. 261.
For the summation of infinite series the author gives I new and
ingenious method, which is very easy and extensive in its applica-
tion."—Neweastle Magazine, November, 1825.
A TREATISE on the GENERAL THEORY and SOLUTION
of ALGEBRAICAL EQUATIONS, intended as a Stipples
mentary Volume to the 'Treatise on Algebra, 12m0,, 7.5,
* „ 4 In this volume the recently discovered method of solving
Numerical Equations by Continuous Approximation is reduced to
the utmost simplicity a form of which that inethixl appears sus-
ceptible.
.....—....,2,NT of PLANE and SPHERICAL TRIGONO-
METRY, with its Application to the Pi inciples of Navigation
and Nautical Astronomy, with the necessary Logarithanc and
Trigonometrical Tables. By J. R. YOUNG. Duodecimo.
66. cloth, or, with the Mathematical Tables, 12s.
" * * * * * 'These reflections have originated in a comparison
of Mr. Young's excellent treatise on Trigonometry, with some
other works that have made their appearance within the last ten or
twelve years, and a comparison of all these with the standard
worlse that preceded them. We have more than once taken occa-
sion to express the opinion we were led to form of this gentleman's
course of analytical mathematics ; and, though in some respects the
nature of the work itself affords less scope fur the exercise of that
happy faculty which Mr. Young possesses for exposing the paralo-
gisras and supplying satisfactory solutions for the elementary diffi-
culties of science—yet in many parts we see traces of that same
peculiar attention to logical and philosophical accuracy which dis-
tinguished his former writings. The great value of this work, we

lIAPPINESS, " the gay to-morrow of the mind,',
is insured by marriage. Previous, however, to entering
into the hallowed obligation of marriage, it becomes an impressive
duty not only to regulate the passions, but to cleanse the grosser
nature from those impurities which the freedom of unrestricted
pleasure may have entailed upon it. Luxurious habits will effemi-
nize the body—a residence in the tropics will relax the elastic fibre
—but more especially does the premature infatuation of youth too
frequently compromise the natural dignity into a state of inanition,
from whence the agonized sufferer more than doubts the chance of
relief. To all such, then, we address ourselves, offering hope—
energy—muscular strength—felicity. The easy cares of married
life are sometimes disturbed by the suspension of those blessings
which concentrate the nuptial wreath—for the female habit is often
constitutionally weak—yet it can be strengthened, and deficient
energy improved into functional power. In every case of syphilit;:e
intrusion, as well as in every relaxation of the generative er,,:nonly,
we pledge our ability to cure speedily, and with effect "
in cur own honourable integrity as Members of
College of Sur-
geons, we refer the suffering communit;
of either sex (especially
those entering into matrimonial Confident
once to our house, where
daily attendance is given 9-Jat o
and letters
from the country arm r personal consultation ,
immediately answered ; these must contain a
remittance Advice and Medicine, describing minutely the case,
Wl'Lin can be forwarded to any part of the world, however distant.
aNnod carefullydififeu protected from difficulty canoccur,aosm obtheseArlveadtiicoin.ne will be securely packed,

GOSS and CO. (M. R. C. Surgeons),
7, Lancaster-place, Strand, London.
Just published (twenty first edition)---Ist. The )EGIS of LIFE,
a familiar commentary on the above Diseases.-2d. HYGEIANA,
addressed exclusively to the Female Sex.-3d. The SYPHILIST,
a Treatise on Lues Yenerea, Gonorrhoea, &c.—May be had at 23.
Paternoster-row, London ; 72, Grafton-street, Dublin ; 12, Cal-
tan-street, Edinburgh ; 86, Trongate, Glasgow ; and of all book-
sellers. Price ss. each.

FOR COUGHS, Colds, Astlimas, Consump-
tions, &c.—HARVEY'S celebrated COUGH PILLS,
prepared from an original recipe of the late Dr. WM. BUCHAN.
Those Pills possess a remarkable property in speedily removing the
most violent and obstinate Coughs, and by promoting an easy ex-
pectoration, their effect will be found to be truly beneficial in
shortness of breath, asthmatic cases, and even in the last stages of
consumption. Be particular to observe that the genuine Pills
have tho name « G. Harvey, No. 63, Great Surrey-street, Lon-
don," on the cover of the box ; prico 131,4 d. and 2s. 9d. a box.—_
Agents, Sanger, No. 150, Oxford-street ; Barclay, No. 95, Far-
ringdon-street ; Wheaton, No. 11, Sol's-row, Hampstead-road,
and most respectable Medicine-venders in the kingdom; where
also may be had Dr, Smithy itritlbtlious Pills.