Royal Academy of Sciences of Paris. 457 
them for the press, as well as the various accidents to which the 
type is exposed in passing through the hands of the various 
workmen (aéd of which sources of error are completely obviated 
by the present contrivance); we cannot sufficiently congratulate 
our readers on so valuable an acquisition, which we trust will be 
secured to this country by the liberal protection and support of 
our own Government to the ingenious inventor. 
Mr. Hardy exhibited a time-piece for determining very small 
portions of time, It showed the =1,th part of a sévond of time. 
M. Fatton (nephew of the celebrated Breguet) exhibited also a 
new Species of chronometer, which, by means of a mechanical 
contrivance annexed to the setlonds hand, marked on the dial- 
plate the fractional part of a second: thereby affording to ob- 
servers an opportunity of registering, during an observation, the 
precise moment at which any phznomenon may occur.—Mr, Ro- 
binson- likewise exhibited -his micrometer with two fixed spider 
lines, and one moveable line: which for economy and sila 
is worthy the attention of every practical astronomer, 
The Society adjourned, for the summer recess, till Friday, 
November 8th. 
ROYAL ACADEMY OF SCIENCES OF PARIS, 
At the sitting of this Academy on the 7th of January, 
M. G. St. Hilaire read a paper entitled ** Observations on dif- 
ferent encephalic parts found in human monsters reputed to be 
without the brain, and named after this hypothesis Anecephales.” 
M. Desmarets ‘read ‘a memoir “On ‘the Crustaceous Fossils.” 
M. Ampere, one “ On the rotation of a Magnet, which only turns 
upon its axis by the action of a metallic wire joining the two 
extremities of a Voltaic pile,” a phenomenon which Mr. Faraday 
had in vain attempted to produce. On the l4th of January 
My Fourier read a memoir ‘ On the general principles of Alge- 
braic Analysis.” . M. Brongniart the younger read a paper upon 
“ the classification and the distribution of vegetable Fossils in 
general.” . M. G. St. Hilaire, a Memoir * sur les voies. diges- 
tives des monstres acephales.”” On the 22d, M. Gaetano Rosina 
read a paper “ On azote, carbon, and hydrogen, rendered solid 
by the means of oxide of iron; with a bottle containing a speci- 
men of the substance.” M. G, St. Hilaire read a memoir ‘f On 
the intestinal nutrition of the foetus, and on its great conformity 
with the intestinal nutrition in adult animals.” M. Cauchy, one 
On development i in series, and on the integration of differential 
equations.” On the 25th M. Laugier presented a paper on the 
acrolithe of Juvenas, and an extract was read from a work of 
M.Reboul ou the Pyrenees. ._M. Delambre gave a verbal ac- 
count of the new part of the translations of M. Halma. 
Vol. 59. No. 290, June 1822, 3M Pls 
