Percentage change of weight. 
62 2 ). Thoday. 
Fig. 3. Mercuric chloride. 
on the surface tension, but a rough test with capillary tubes showed 
no appreciable difference of capillary rise as between the M/100 
solution and distilled water. Observations on the changes in total 
volume of pieces of potato and the liquid in which they were 
immersed showed a small decrease, indicating some injection, but 
no significant difference between an M/100 solution and water. 
In order to settle the question, experiments have been made 
recently in which pieces of potato were injected under the air- 
pump. 
In some of these experiments one lot was injected with water, 
the other with the solution. In these the greater increase in weight 
was demonstrated only in the first period which included the actual 
injection. 
In others both lots were injected with water, and then immersed 
in M/100 H g Cl 3 and distilled water respectively. In these the 
ncrease of weight was always much greater in the solution during 
the first quarter-of-an-hour. The following data are taken from one 
of these experiments: 
