810.) 
count of the present State of the Spanish 
Colonies in America, and.a parucular 
report on Hispaniola, the Spanish divi- 
sion of the Island of Santo Domingo, 
with a general survey of the Settlements 
on the Continent of America, their 
history, trade, navigation, productions, 
population, customs, manners, &c. 
Messrs. SmrtH.and Sox, of Glasgow, 
have in the press, a Catalogue contain- 
ing many works that will interest the 
bibliographer from their extreme rarity. 
The black letter and early printed books 
are most of them in fine condition. 
Mr. W. Moors, of the Royal Academy 
at Woolwich, has in forwardness aTreatise 
on the Doctrine of Fluxions, with its ap- 
plication to all the most useful parts of 
the true Theory of Gunnery, and other 
very Important matters relating to Mihi. 
tary and Naval Science. The fiuxions 
will be preceded by such parts of the 
scieuce of mechanics, as are necessary 
fur reading the work without referring 
to other authors. 
The death of the Rev. Ricuarp Cr- 
cit baviitg taken place during the pro- 
gress of his. works through the press, it 
is intended to add a fourth volume to 
the three already announced. “This 
fourth volume, consisting of Remarks 
made by Mr. Cecil, in conversation, on a 
great variety of topics in Life and Re- 
ligion; could not, from. the nature of 
its contents, be published with propriety 
before bis death; but that event having 
now occurred, it is become desirable to 
publish together all that will ever appear 
of lis works. A Memoir of Mr. Cecil 
will be prefixed to the first volume; and 
ic is hoped the whole will be ready by 
Christmas. 
ir, Henry, of Manchester, has lately 
published An ‘Analysis of several -varie- 
ties of British and foreign salt (muriate 
of soda), with a view ‘to explain their 
fitness for different. economical purposes. 
He proves that British salts are no way in- 
ferorto foreign salts; and states, that that 
kind of sale which possesses most emis 
nently the combined properties of hard- 
ness, .compactness,)..and perfecti ion, of 
enyspals, will be best adapted to the pur- 
pose of packing fsh and other provision ; 
because it will remain permanently be- 
tween the different layers, or will be 
very gradually dissolved by the fluids 
that exude from the provision; thus fur- 
nishing a slow, but constant, supply of 
gaturated brine. On the other hand, 
for the purpose of preparing the pickle, 
oP of striking the meat, which 1s done by 
, 
Literary and Philosophical Intelligence. 
153 
immersion in a saturated solation of 
salt, the smaller-grained varieties answer 
equally well; or, on account of they 
greater solubility, even better. 
Messrs. Curmpertson and SINcEN 
have lately published the following coms 
parison of the cylinder and plate exciters 
in electrical machines: The principal ; 
advantages 1 in the cylinder are, 1st, the 
positive and negative powers are obtained 
in equal per fection ; ; 2dly, it has but one. 
rubber to keep in order ; 3dly, it is less: 
liable (from the security of its form) to. 
accidental fracture, than the plate; 4thly, 
its insulation 1s more perfect ; - and Sthly, 
from the peculiarity of its structure, 
larger multiplying wheels may be em- 
ployed, and thus a considerable dim. 
nution of friction be obtained. ~The 
advantages of the plate machines are, 
ist, they are less expensive than cylinders 
of equal power; Qaly, they occupy less: 
room; Sdly, may be constructed of a 
much. larger size, as instanced by Mr. 
Cuthbertson’ 5 large machine at Harlem ;. 
4thly, several plates, to act jointly, may: 
be more easily combined, tian several 
cylinders could; 5Sthly, the multiplying 
power may be applied to them toa much 
greater extent than it could to cylinders, 
without rendering the motion too rapids 
6thly, plates of equa! diameters: may be 
made to act witha uniform and equal 
degree of power, a circumstance. seldom 
attained by cylinders. 
At the Medical School of Guy’s Hoe 
pital, the autumnal course of Lectures 
will commence in the bezinning of Oc- 
tober, viz. The Practice of Medicine, b 
Dr. Basrncron and Dr. Curry; Che 
mistry, by Dr. Basincron, Dr. Man- 
crt, and Mr. Arten; Experimental 
Philosophy, by Mr. Auten ; Theory of 
Medicine, and Materia | Medica, by Dre 
Curry and Dr... CuotmeLey ; Mid. 
wifery, and Diseases of Women and Chile 
dren, by Dr. Harcuton; Physivlogy, or 
Laws of the Animal Gconomy,- by Dr, 
Harcuron; Structure and Diseases of 
the ‘Teeth, by, Mr. Fox. These several 
Lectures, with those on Anatomy and 
on the, Principles aud Practice of SUIBerYs 
given at tpe Theatre of St. Thomas's 
Hospital adjoining, are so arranged, that 
no two. of them interfere im the hours of 
attendance ; and the whole is calculated 
to forma complete course of medical and” 
chirurgical instruction, 
Dr. Rerp’s next course of Lectures on 
the Theory and Practice of Medicine 
will commence on Monday the eighta 
of October, and will conclude on’ Mou- 
Gay 
t 
