PHYSIOLOGICAL ACTION OF AMIDOSULPHONIC ACII>. 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 

 healthy/" 



In the third experiment plants of Allium fistirfosum about 

 30 cm. in length were placed in 0.5 p. m. solutions. 



A noxious effect was here noticed after 14 clays, 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 plants 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 I 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 bhoots. 



Dcntli set in : 





At the beginning : 



After 1 1 days : 



A 



8 cm. 



8 cm. 



In 1 1 days. 



B 



9 „ 



9 » 



In 14 ,, 



C 



8 „ 



18 „ 





II. Experiments with Branches. 



In the I p. m. solutions above mentioned were placed on the 

 3rd of March, small twigs of Prunus domestiens 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 amidosulphonatc (A). On 



(1 ) Diamidogen in a dilution of 0.5 p. m. killed the plants in about the same time as 

 amidosulphonic acid. 



