THE COHESION OF LIQUIDS. 701 











G.t. | Wt. R. G.t. Wt. R. 
42°30" ‘4136 grm. ‘0096 grm. 0:49” ‘4903 germ. 1:001 erm. 
23°00 ‘4150, Ors) 0:40 5004 _,, T2525 5, 
15-00 ‘4157, Dae SS 0:39 ‘5008 so, 1300 74, 
12°80 ANTS 5 0326 _,, 0:36 5049 1414 
9 60 ‘AQ1A 0438, 0°35 5115, 1421 | 
755 ‘4227 012) 0°32 ‘Lao —,, 1608" 
540 ‘4239 _,, ‘0785 0:27 5230 __,, 1934, 
4:80 “4265, OSaol a 0:25 5365, 2144, 
4:50 ‘4306 _,, O95 (55 0:22 5382, 2-450, 
3°50 4300, 1220185, 0:218 ‘5475, 20S 
2°70 4345, ‘GODS ¥, 0-192 ‘5514, 2859, 5 
2:05 ‘4347, 2120) % 0-175 ‘DoO1 ,, 3216 _,, 
1:90 ‘4435, ‘2334 0164 elo) &,, 3476 ,, 
1-40 ‘4494 o210 0, 0-157 ‘5742, S010; 
1:00 ‘4598 __,, 4598, 0-143 oo) ae 4150, 
0°80 ‘4623 _,, (88 0-131 6003, 4594, 
0-78 AD), 160030 5 0124 76200" 5054 
0:56 "AGol .;, ‘8662 __,, 0-111 "6325, ale, 
0°52 ‘4838 9305 _,, 0-100 6431, 6431, 




In this table Professor GuTHRIE’s nomenclature is used, calling the time 
between the falling of the drops growth-time or G.t., callmg w the weight of 
mercury the bulb holds at the temperature at which the experiment is made to 
the time required to empty the bulb, and ” the number of drops. We have 

Gate fe ? 
1 
Ww 
Wt. =", 
Ww 
R. = a. 
The subjoined curve illustrates graphically the above table, and the formula 
‘4130 + ‘08337 — 00747" is one which agrees pretty well with the results. It 
will be seen that the above table does not represent a very regular curve; but 
there are places where the increase in weight is less than what would be 
expected, so that no formula will exactly fit the curve. These numbers are 
indeed experimental irregularities, caused by the vibration of breaking being 
continued in the new drop, and affecting it as before explained, and they only 
occur where the rate of dropping and vibration are in some way in agreement. 
It must also be remembered that a drop changes in form after it is formed, so 
that this may in some way affect the results. When the rate is very slow, the 
first error disappears ; and as the second must be inconsiderable, a minute 
examination of the rate of decrease at very long growth-times would be likely 
to yield a more correct formula, but the above serves to illustrate the method. 
VOL. XXVIII. PART II. 8 U 
