goes on in geometrical progression, and being very slow exerts fo 
sensible influence on the duration of each oscillation. But the pres- 
-sure of the air, which does not alter the amplitude of the oscillations, 
influences their duration, both because it is not the same in thesev- 
eral horizontal sections, and because it changes in different parts of 
the surface, in proportion to the condensation and dilatations-which 
accompany the motions of the air... M. Poisson obtains also, by an- 
alytic theory, a result which accords in a satisfactory manner With — 
the direct experiments made on this subject by Captain Sabine. It 
results’ from this that the correction relative to the reduction toa 
“vacuum ought.to be increased one half, which gives rise to am aug- 
mentation of +;;%;53 in the length of the single pendulum which 
beats seconds. This length, estimated in parts of the metre, thus be- 
comes for Paris, according to the experiments of Borda, 0”.993856. 
The expression of the gravity at the surface of the earth ( 
b by double the it causes 2 body to pass through in a va- 
cuum dutiog lie first second-of its fall,) is then 9".80897 ; and-the 
mass of the earth, as La Place determines it, must be also increased 
about TossID which rises it to = ae , vis of that of the. 
Univ. Avril, 1832. I an antes 
eT 
Franch: ci AND ’ SoMESTIO ECONOMY.” 
$: SD thd eater of Beets ar lil momen 
sea In the year 1829—30, nearly two hundred sugar mapu- 
factories in France produced fromnin eto ten millions of kilogrammes 
c r, and it is believed: that in 1830—1831, two hundred 
_ This business 
aa ainianansbonatya farming labor,: -and| may be usefully 
combined with the work of a farm of moderate size, on which from 
eaey five to‘one bie chatncig thousand kilogrammes ‘of root: cans be 
ment ac a | a , aoe 
eer he pre graf eet nto nikita? 
ically den ve eet: however; in all sugars, «slight 
ssiraliuaidiiepeenanae darianinenaareroner= See 
rie acid at 25° on sugar until eee 
@ay taey 
oo F pt pitate, ait 
