488 
MAENO. 
the living cells, and such may also be the case with amido- 
sulphonic acid taken up by the plants. (I) 
NH 2 COOH nh 2 so 2 oh 
Carbamic acid. Amido-sulphonic acid. 
In ail my experiments with whole plants, young branches 
and isolated leaves, I used a I p. m. or 0.5 p. m. amido-sulphonic 
acid solution in the form of the calcium salt. (2) To these solutions 
were further added 0.05 % mono-potassium phosphate, 0.05 °/o 
magnesium sulphate and 0.2 °/o calcium sulphate. The control- 
solution contained in place of amidosulphonate, an equal amount 
of ammonium sulphate. 
At the same time one or more of the plants were also placed 
in distilled water. 
We will call for the sake of abbreviation the plants in the 
solution containing the amidosulphonate (A) ; those in ammonium 
sulphate (B), and the plants in distilled water (C). 
I. Experiments zvith Whole Plants . 
Barley plants were taken carefully from the field on the 19th 
February and after carefully washing the roots, they were placed 
in the solutions mentioned. The result is seen from the following 
table : 
Length of plants at 
the beginning. 
Length of plants 
after 9 days. 
Water absorbed in 
6 days. 
A 
24.5 cm. 
24.5 cm. 
46 c. c. 
B 
24-0 „ 
25*® j> 
105 „ 
C 
21.0 „ 
23-0 „ 
120 „ 
The plant (A) appeared so much damaged by the withering of 
the leaves on the 9th day that complete death set in two days 
later ; the chlorophyl of the younger leaves had turned yellow 
before they succumbed. While no traces of new rootlets were to 
be observed in the plant (A), the control plants which remained 
healthy for a long time had developed them in great numbers. 
(1) According to an observation of Dr. Divers to whom thanks are due for having 
provided our laboratory with a large amount of amidosulphonic acid, only the am¬ 
monium salt of this acid is easily hydrolysed in aqueous solution. 
(2) In a few cases I also used the sodium salt with the same results. 
