I9I9] 



KNUDSON 6- SMITH— AMYLASE 



46s 



reducing sugar, which was equivalent to 73 mg. of glucose per 

 20 cc. of the culture solution. 



In conclusion, therefore, it may be stated that neither Zea 

 mays L. nor Pisiim arvense L. is capable of utilizing soluble starch 



TABLE II 



directly or indirectly, nor is there any appreciable secretion of 

 amylase by the roots of these plants, at least under conditions such 

 as were maintained for these experiments. 



Cornell University 

 Ithaca, N.Y. 



LITERATURE CITED 



1. Kendall, E. C, A new method for the determination of reducing sugars. 

 Jour. Amer. Chem. Soc. 34:317-341. 1911. 



2. Knudson, Lewis, Influence of certain carbohydrates on green plants. 

 Cornell Univ. Agric. Exp. Sta. Memoir 9:9-75. 1916. 



3. Laurent, J., Recherches sur la nutrition carbonee des plantes vertes a 

 I'aide de matieres organiques. Rev. Gen. Bot. 16:14-48, 68-80, 96-119, 

 120-128, 155-166, 188-202, 231-241. 1904. 



