PHYSIOLOGICAL ACTION OF AMIDOSULPHONIC ACID. 489 
For the next experiment young plants of Brassica Rapa 
14 cm. in height were selected. Although the amount of amido- 
sulphonic acid here did not exceed 0.5 p. m. the plants (A) died 
within 7 days, while the control plants B and C remained 
heal thy. (1) 
« 
In the third experiment plants of Allium ftstulosum about 
30 cm. in length were placed in 0.5 p. m. solutions. 
A noxious effect was here noticed after 14 days, the tips of 
the leaves became yellow, lost their turgor, and withered. Com¬ 
plete death had set in after 29 days with the plants A, while the 
control plants B and C still exhibited a healthy appearance. 
The plants A had grown during the first 7 days 9 cm. on 
the average, but the pla'nts B more than double that height. 
For the fourth experiment young plants of Soya beans 
were used. The seeds were soaked for several days in water and 
then left to germinate on moistened filter paper. The shoots 
were placed in 1 p. m. solutions. In this case not only the amido- 
sulphonate but also the ammonium sulphate exhibited a decided¬ 
ly noxious action. 
Length of the shoots. 
Death set in : 
At the beginning : 
After 11 days : 
A 
8 cm. 
8 cm. 
In 11 days. 
B 
9 „ 
9 » 
In 14 „ 
C 
3 „ 
18 „ 
— 
II. Experiments with Branches. 
In the i p. m. solutions above mentioned were placed on the 
3rd of March, small twigs of Prunus domesticus 12-15 cm. 
length and bearing flower-buds ; the buds of those twigs that 
were kept in water opened on the next day. One day later, the 
buds of the branches kept in ammonium sulphate followed and 4 
days later, those of the branches in amidosulphonate (A). On 
(1) Diamidogen in a dilution of 0.5 p. m. killed the plants in about the same time as 
amidosulphonic acid. 
