1896 | TOXIC ACTION OF DISSOLVED SALTS gt 
TABULATED DATA. 
The detailed results of the most essential experiments are 
presented in the appended tables. At the top of each table is 
given its number, the substance used, and, in the second line, the 
date at which the radicles were set into the solutions, and the 
date at which the results were observed. The distance at which 
the mark previously mentioned was placed from the root tip was 
always 15™". In the first column appear the concentrations 
used expressed in gram-molecules or gram-equivalents per 
liter of the solution. The column headed “length’’ shows the 
distance between the line and the root tip, giving, therefore, 
after subtracting 15™™, the growth made during the period 
indicated. If further observations and measurements were - 
made, the dates and lengths are placed in adjacent columns. 
Under “remarks” are verbal indications on the condition 
of the radicles. Death or survival indicates the condition 
at the time given in column two. The number of horizontal 
readings under each concentration shows the number of roots 
employed and their individual records. For a large majority of 
the substances, there appears in the table the record of the last 
plainly fatal dilution and of all weaker solutions as far as tested. 
Thus the concentration limit in most cases is the second con- 
centration in the table. 
It will be noted in the concentrations not fatal, that, in general, 
the amount of growth increases as the concentration decreases. 
Since, in these experiments, external conditions were not particu- 
larly controlled, the value of the growth rates must not be over- 
estimated and are significant only in features recurring with 
regularity. 
Tables 1 to 5 show that the seedlings just survive in a solu- 
se that contains szoy gram of hydrogen ions per liter. It is 
evident from what has been stated before that the anions have 
no toxic action at this dilution, and that the poisonous action of 
the solutions is solely due to the hydrogen ions present, inasmuch 
as these various acids affect the seedlings alike. 
