Notes on scientific research. 155 



Nitrogenous Bodies. 



According to L. Rosenthaler 1 ), the youngest leaves of the cherry laurel, as long 

 as they are not fully developed, show the highest content of hydrocyanic acid. Later 

 on, the differences in growth are no more marked to such an extent. Both halves 

 of the leaf, likewise the outer and the inner part, or the upper and the lower part, 

 contain very nearly the same quantity of the acid. The central nerve, however, 

 especially in young leaves, is richer in hydrocyanic acid than the leaf tissue. 



Sidphocyanic acid was proved to be present by S. Dezani 2 ) in the extracts of the 

 roots of Brassica Rapa. L., Cochlearia Armoracia, L, and Raphanus sativus, L., in the 

 fresh herb of Raphanus Raphanistrum , Cav. Desc, Thlaspi bursa pastoris, L., Calepina 

 Corrini, Desv., Sisymbrium Alliaria. Scop., S. officinale, Scop., Nasturtium officinale. 

 R. Br., Bunias Erucago, L., Eruca sativa, Mill., Sinapis alba, L, 8. nigra, L, and 

 S. arvensis. L. The sulphocyanic acid occurs probably as such in the plants and is 

 not a decomposition-product of a mustard oil. 



J ) Schueiz. Apoth.-Ztg. 59 (1921), 10 and 22. As per Chem. ZentralU. 1921, I, 774. — x ) Staz. sperim. 

 agrar. ital. 53 (1920), 438. As per Chem. ZentralU. 1921, I. 814. 



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