536 Bottomley . — The Significance of Certain 
bottles were aerated daily, and the solutions changed twice a week, while 
at the end of every sixteen or seventeen days the plants were removed, 
dried, and weighed. 
The results obtained are shown in the following table : 
Table III. 
Series. Weight of set of 18 plants. 
I. Pure food solution Original weight 4*73 grm. 
After 16 days 5*42 grm. 
After further 17 days 5*29 grm. 
After further 17 days 4*33 grm. 
II. Pure food solution plus silver fraction Original weight 4*73 grm. 
After 16 days 3*57 grm. 
After further 1 7 days 6*65 grm. 
After further 17 days 7*33 grm. 
Percentage gain or 
loss on original 
weight . 
+ H-7 % 
+ n-8% 
- 8-4% 
+ 17-7% 
+ 4 °’ 6 % 
+ 54 ’ 9 % 
The results are graphically represented in Diagram 1, in which the 
dotted line represents the changes in weight of the series in pure food, and 
the unbroken line shows the progressive increase in weight obtained by 
addition of the silver fraction. 
Time in days 
Diagram i. 
