> 
Floating Bodies and the Theory of Capillarity. 318 
theory, these values should be the same for the same liquid at 
the same temperature ; and moreover, these values ought to be 
the same for all variations of h a nd d, and h’ and d’ respect- 
ively. Finally, as this postulate depend upon the verification 
of Jurin’s law, it follows that the products, hxd and h’xd’ 
respectively ought to be constant for each pair of the factors; 
and also, that when d=d', h'xd’= bine 
These deductions of theory can, unfortunately, only be ex- 
perimentally tested in the case of water in contact with clean 
glass. In order to make the comparison of the results of the- 
ory and experiment, I have computed the following table in 
which the values of d d, h, d’ and h’ are furnished by the admi- 
rable experiments of M. Simon (of M etz).* The value of a 
's taken, in accordance with Quincke experiments, as =25° 32’; 
bat inasmuch as this divisor is assumed to be constant, its abso- 
lute value is of no consequence in the sen ea a 
WATER IN TUBES. WATER BETWEEN PARALLEL PLATES. 
; xd iat 
a A in =Aeosal| @ in h’ in ~Y2 cosa 
milime- | millime- | xd. | in grams || millime- | millime-| A’ x d'. | in grame 
“tere. percen tim.|| ters. ters. - | percentim, 
of contour. of contour. 
Peet ih Ee 
25°30 , 0019 0-481 00013 || 23-000 0.021 0-49 00027 
18-000 0°200 3°600 | 0-0100 |] 18-000 0-062 112 0-0062 
14-000 0-440 | 6160} 06-0171 || 14000 | 0140 | 1:96 | 00109 
8°600 151¢ | 12-986 | 9-03 10-000 | 0:340 | 3-40 | 00188 
5-400 3°650 | 19-710 | 0-0546 || 5°000 | 1:250 | 625 | 0-0346 
2"200 12°800 | 28-160 | 0-0780 || 2-090 | 4:230! 884 | 0°0490 
1:250 24-000 | 30-000 | 0-0831 || 1-260 | 7-420 | 9°35 | 0-0518 
0570 55°600 | 31°692 | 9-u878 0°518 | 19°300 | 9°91 0:0549 
"360 89000 | 32-040 | 0-0888 || 0-404 | 26-000 | 10°10 | 0°0560 
9140 | 233-000 | 32-620 | 0-0904 || 0-140 | 73°780 | 10°33 | 0-0572 
9050 | 663-000 | 33-150 | 0-091 
0°025 ne 000 | 33-325 | 0-0923 
0-012 00 | 34-608 | 0-0959 
0061 | 6828-000, 41-651 | O-1154. | 
cl eh ate at the numbers ene a) in the foregoing table 
early in vie the following conclusio : 
; Then € numbers in the columns headed ax and d’x‘h sone 
that Furinta | law fails to be even paige sone verified, when 
and a’ respectively exceed 0-2 of a centimeter 
2. That when d=d', d’xh’ in all cases falls ‘short of being 
equal to xh. ; the ratio of the products, under these condi- 
eee de Chim. et de Phys., III, vol. xxii, pp. 12 et 19, omg 
Am. Jour. Scr.—Turep Serres, Vor. XXVII, No. 160.—Arntt, 1884. 
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