Intelligence and Miscellaneous Articles. 317 
Volumes borne (in millimetres) by 1 millim. perimeter (at a tempe- 
rature 50° to 59° F., except with wax). 
I Bs - 5 
s ee eS a 
e 38 2) B) 2] 3 
E EMA ea ed: 
oe Z E 
no 
Internal diam. 
millims. | 
Narrow tubes...| 0-15—1-8 7-537 6182 | 3-720| 3-507) 3-072) 2-618 
27104 ” ” ” 3362 ” ” 
Middling 5246 e i HEN S| nae Ne 
tubes ...... 5-510 " A » |ol5el 4, ¥ 
6244 ” | ” ” 3221) ” ” 
Large tubes ...) 12—80 |<5-8, >5:6 —5,>3:7/3-7 | 3:366) 3-1 os 
Onemplaner soec|| ccc... 5148 3264 | 38:457| 3-470) 3169) ,, 
{| Distance. 
1] 9-740 5-187 3329 | 3:779| ,, | 3:254| 2°673 
7-930 5-196 | 3340 [3-623] ,, |3-277| 2-672 
5344 5179 3352 |3:952| ,, | 3-178| 2:649 
Two parallel 3940 5-272 3345 | 3-833! ,, | 2-979| 2-542 
planes......4 | 2-640 5-142 3-432 |3-899| | | 3-088) 2-505 
1:332 5-088 3361 | 3-927) ,, | 3-133) 2692 
0-882 5-133 3597 |3:807| ,, | 3-185| 2:7038 
0-394 5-197 3554 |3-776| ,, | 3-170) 2-622 
[| 0-236 5-192 " 3-821} ,, | 3-272) 2-732 
{ |External diam. 
34-25 5-071 2-915 |3:397) ,, |3:021) ,, 
22-03 4-819 2:778 | 3°170| 2-926) 2-976|_,, 
14-92 4727 2615 |2-778| ,, |2-764| ,, 
é : 10-09 4-500 2-450 | 2°794| 3-477 2-799) 2-296 
Se Nee eylin- J | “4-86 3:953 2-187 | 2-753) 2-691) 2-730 2-371 
ESE (stetee 3-02 3-800 2-353 | 2-861) 2-555) 2-281) 2-185 
1-648 3057 | 2262 | 2-451) 2-089) 1-732! 2-470 
1-032 1-948 1-912 | 2017) 2-075) 1-642) 2-212 
0-676 1-988 1-674 | 1-564| 1-790 1-398] ,, 
[| 0-332 1-464 0-784 | 1-218) 2-289) 0-774! ,, 
From the numbers contained in this Table we may draw the fol- 
lowing conclusions :—- 
1. Two parallel planes raise a constant volume, whatever may be 
their distance, and even when this distance is infinitely great. As 
regards water, the curve which I have found for a single plane 
accords very well with that observed by Hagen; the values of h 
between two planes differ but little from those found by Simon (of 
Metz), only the latter physicist has wrongly attempted to apply to 
all distances, a law which mathematicians have never enunciated 
except as being approximatively true for very small distances. 
2. The constant capillarity calculated from experiments made 
with narrow tubes with some liquids is equal, and with others far 
superior to that determined by means of two planes; it is accidental 
that with water the relation between these two yalues is evidently 
