Chemistry and Physics, lll 
No. of Volume at 100° C C ibility. 
Alloy. Observed. Cues ula! ted. overt ge setae 
6. 4064 3972 9-808 9°801 0°245 1:28 
. a 5098 5207 8-772 8-738 3°96 559 
8. 4086 * 4026 9°845 9850 0°257 1°30 
9. 8621 6007 10°956 10°541 2-09 4:23 
10. 5719 6328 ent ne fee 21°71 40°20 
11, 4238 5919 11:833 11-978 14°97 85°51 
12. 4428 6223 ee meee 6-00 28°25 
13. 5166 5649 12°257 12215 20°93 94°62 
14, 4916 5128 14870 14:847 14°59 «©8652 
15. 4300 4698 17°540 174938 20°91 78°38 
16. 4568 5207 ee ee 670 83°60 
17. 4657 4716 4 us 1200 88°25 
18 5436 5233 5 see 67°85 95-00 
19, 5713 5607 6300 98°20 
The volume at 0° C. being 1. Foam hase tnideet Me tthiessen con- 
cludes that the volume (as (as well as the — gravity) of any alloy be- 
mean of the vo 
© nor specific gravity depends on the chemical nature of the allo ; 
While the Jast two columns show that the oe gamete pe not 
being simply the calculated mean, does depend on chemical con 
tion of the a alloy. In his concluding remarks, Monhiaen ree 
he is able to calculate the conductibility of any alloy if it be considered 
as a “solidified solution of one metal in the other.” —Pogg. grnars 
6; Cosmos, 1867, v, 160. 
: tory theory of heat——Baniner says that his keene ‘fret 
Published in 1838 j is - new; we give the following extract from L’In- 
Stitut, 1866, bp. 340-342. 
The of a molecule is its vis-viva ; two molecules are in caloric 
Squilibrium whet they possess the same vis-viva. In this condition they 
Soy ene at a distance or in contact excha ange equal quantities of heat, 
and if placed in the same sphere, they will produce the same radiation. 
8 represents the mass of a molecule of oxygen having a velocity v, 
'c H and w’, the same e quantities for hydrogen; then these molecules 
ve the same quantity of heat and the same temperature if 
H 
a Gee ce en ee ee eS eee ee re a, — ee 
As 8=16H, “ have v’= 
rh any two atoms m ao m!’ with the velocities v and v’ we have 
At mv2=m'y'?, 
any other tem ure these atoms are still in equilibrium if their 
NeW Velocities of vibration w and w full = 
pte 
sequently my? —mu2—m'vy!2 —m'u'2 
. the two atoms gain or lose the same quantities"of heat between 
Wo given temperatures. Or in other words, the specific heat of element- 
ary atoms is constant, which is the law of Dulong and Petit. a 
rding to Babinet, all molecules, vibrating Pps Le have the 
od (solid, li uid or gaseous’ ompr the untt of one dy- 
= calory—'ig the excess opie any molecule at ri Eon 
