380 
ME. T. GEAHAM ON LIQUID TEANSPIEATION 
Alcohol. 
The fundamental discovery made by Poiseuille of a point of maximum retardation 
in the transpiration of diluted alcohol is fully confirmed in the following series of obser- 
vations. The transpiration-time rises from that of absolute alcohol, 1T957 (water bein® 
1), to 2*7872, when the alcohol is united with 6 equivalents of water, and then falls off 
again by further additions of water. 
Table VIII. — Transpiration of Alcohol, at 20°, by Capillary D. 
(Transpiration-time of water, 470 seconds.) 
Water added to 100 Alcohol. 
Water, per cent. 
Transpiration-time. 
Specific gravity, 
at 15°. 
In seconds. 
Water = 1. 
0 
0 
562 
1*1957 
1 
0*99 
578 
1*2297 
*7069 
3 
2*91 
615 
1*3085 
*8030 
5 
4*76 
650 
1*3829 
*8083 
7 
6*54 
695 
1*4787 
10 
9*09 
734 
1*5617 
20 
16*66 
851 
1*8106 
*8396 
30 
23*07 
950 
2*0212 
*8557 
40 
28*50 
1029 
2-1893 
*8683 
50 
33*33 
1093 
2*3253 
*8800 
60 
37*50 
1152 
2*4510 
*8897 
70 
41*17 
1213 
2*5808 
•8983 
72-5 
42*02 
1230 
2*6170 
•9003 
75 
42*85 
1231 
2*6191 
*9021 
78*26 ... 4 eqs. IIO 
43*94 
1239 
2-6361 
*9045 , 
80 
44-44 
1238 
2*6340 
*9058 
82*5 
45*20 
1242 
2-6425 
*9073 
85 
45*94 
1244 
2-6468 
*9088 
90 
47*36 
1256 
2-6723 
*9120 
100 
50*00 
1268 
2*6978 
*9183 
no 
52-38 
1282 
2*7276 
*9235 
112*5 
52*94 
1287 
2*7382 
*9249 
115 
53-49 
1298 
2*7617 
*9255 
117*39 ... 6 eqs. HO 
54*04 
1310 
2*7872 
*9271 
120 
54*54 
1307 
2*7808 
*9288 
122 
55*05 
1300 
2-7659 
*9292 
125 
55-55 
1297 
2*7595 
*9304 
130 
56*52 
1297 
2*7595 
•9328 
140 
58*33 
1295 
2*7553 
•9363 
150 
60-00 
1280 
2*7234 
*9396 
160 
61*53 
1255 
2*6702 
*9430 
170 
62*92 
1250 
2*6505 
•9451 
180 
64-28 
1246 
2*6510 
*9482 
190 
65*51 
1240 
2-6382 
*9500 
200 
66-66 
1235 
2*6276 
*9521 
250 
71*42 
1165 
2*4787 
*9601 
300 
75*00 
1094 
2*3276 
*9652 
350 
77*77 
1026 
2*1829 
*9689 
400 
80-00 
973 
2*0702 
*9716 
450 
81*80 
934 
1*9872 
*9738 
500 
83*33 
908 
1*9319 
*9759 
It will be observed that after attaining its maximum the transpiration-time falls off 
in a very gradual manner, till another equivalent at least of water has been added. 
With still further dilution the shortening of the transpiration-time is considerably more 
rapid. The Table appears to indicate a slight retardation at the proportion of fom* equi- 
