﻿194 Mr. William Sutherland on the 



was always brought to the level of this second mark, so that 

 the length of the column raised by capillaiy action in the tube 

 was always 184 millim. The open limb of the V-tube was 

 provided with a loose cork to prevent evaporation. The 

 capillary tube was clamped to a wooden lath hinged at one 

 end to a stand, and provided at the other end with an index 

 whose terminal point was 610 millim. from the hinge, and to 

 the lath was hinged a wooden piece by which it could be sup- 

 ported at any angle. Instead of reading the angle of incli- 

 nation of the lath and its attached tube, I read on a vertical 

 scale the height of the index above the point indicated by it 

 when the tube was lowered to a horizontal position. The 

 readings thus obtained were accordingly directly proportional 

 to the capillary heights. In the case of water at 15° C. the 

 reading was 196 millim. ; and as the mean result of previous 

 experimenters is that at 15° C. in a tube of 1 millim. radius 

 water rises 14*9 millim., it w 7 as only necessary for me to multiply 

 my readings for various liquids and mixtures at 15° (really 

 14° to 16°) by 14-9/196 to obtain the capillary height h as 

 usually given, namely, number of millim. rise in a tube of 

 1 millim. radius. 



The chief objection that I found to the method of experi- 

 menting was that I had two adjustments to make that depended 

 on one another, namely, that of the level of the liquid in the 

 wide tube and the level of the liquid in the capillary tube. 

 In any further experiments I will take steps to make these 

 two independent of one another. 



The capillary tube and the liquids (except chloroform) in 

 a state of sufficient chemical purity were given to me by 

 Mr. W. Percy Wilkinson, analyst, of Melbourne. The fol- 

 lowing are the capillary heights h of the separate liquids in 

 millim. in a tube of 1 millim. radius, their densities p and 

 their surface-tensions a = hp/2 all at 15° 0. 



Ethyl Carbon di 

 "Water, oxide, sulphide, 

 H 2 0. (C 2 H 5 ) 2 0. CS 2 . 

 h 149 5-4 5-7 



Acetone, 



(CH 3 ) 2 CO 



6-4 



Methyl 



iodide, 



. CH 3 L 



3-3 ' 



Ainyl Ethyl, 

 acetate, acetate, 

 CH 3 C0 2 C 5 H n . CH 3 C0 2 C 2 H 5 

 62 5-9 



p 10 -723 1269 



•802 



2-29 



•879 



•902 



* 7-45 1-95 3-6 



2-55 



3-8 



35 



2-7 



Ethyl aceto- 



acetate, Chloroform, '. 

 C 6 H 10 O 3 . CHC1 3 . 

 h 69 4-0 



Benzene, 



C 6 H 6 . 



73 



Nitro- 

 benzene, 

 C 6 H 5 N0 2 . 

 79 



Anil in, 

 C 6 H 5 NH 2 . 



8-9 



Dimethyl- 

 anilin, 



C 6 H 5 N(CH 3 ) 2 . 

 7-9 



p 1-017 1-484 



•878 



1-209 



1030 



•955 



u 3-5 30 



3-2 



325 



4-6 



3-8 



In working with mixtures of these liquids the general pro- 

 cedure was to make three mixtures in the proportions of 



