SUPPLEMENT 43 



to the comprehensive treatments of the question by MONTEMARTINI (1905) 

 and SCHULZE (1906). 



11- 55-6. f or t which elements ... a discussion read to which organic 

 substances employ the individual constituents of the ash in their constructive 

 metabolism, a discussion 



145, 1. 31, after 1901 b) read According to more recent statements by IWANOFF 

 (1904) one can only say that the assimilation of P obviously also takes place 

 in darkness, and possibly only in living cells. According to BALICKA (1906) 

 part of the phosphoric acid taken up must be utilized without becoming united 

 into an organic compound. 



11. 40-2, for As we know . . . present read (comp. CZAPEK, Biochem.). 



11. 46-7, for from which ... of note read among which carbohydrates 

 starch is specially worthy of note ; 



146, 1. 6, for nitrogen requirements read nutrition 



147, title of lecture, read, 



THE UTILIZATION OF THE PRODUCTS OF ASSIMILATION. I 



DISSOLUTION OF RESERVES IN SEEDS ', ENZYMES. 



I. 7, after from it read and even in leaves it appears only in the course of 

 development 



II. 11-24, f or Migration . . . translocation. read Migration of substances, 

 and especially of carbohydrates, out of the leaf may, as a matter of fact, be 

 easily demonstrated. 



11. 31-3, for There is no fact . . . from the assimilating leaf read Proteid 

 also becomes in general more or less broken down, and the more diffusible 

 substances so produced then suffer translocation. Hence there arises a stream 

 of organic plastic substances from the assimilating leaf 



149, 1. 34, for A similar decomposition read A rapid transformation of the 

 starch into grape sugar 



1. 50, after p. 155). read Starch grains from different plants are unequally 

 resistant to this treatment. 



150, 1. 53, for separate read separates 



last line P. 151, 1. I, delete It might . . . proteid. 

 151, 11. 6-7, for its action . . . substances read the actionof certainsubstanceson it. 



I. 28, after obtained, read Doubtless this curve takes its special form in 

 consequence of the fact that temperature affects diastase in two ways. In 

 the first place, its hydrolytic power rises with temperature like other chemical 

 processes ; on the other hand, however, diastase is destroyed by higher tempera- 

 tures in increasing ratio, so that its amount becomes diminished ; the form of 

 the optimum curve thus depends on these two factors (comp. DUCLEAUX, 1899). 



152, 11. 1-4, delete HANSTEEN . . . asparagin. 



II. 16-19, f or Those with . . . Lecture XVI). read (Exhaustive presenta- 

 tions of our knowledge of enzymes are given by CZAPEK, Biochemie ', HOBER, 

 Phys. Chem. ; DUCLEAUX, 1899, and GREEN, 1899). Enzymes may often be 

 extracted from the organism by means of water or glycerine ; but all enzymes 

 are not so readily extractable as diastase. Since many enzymes cannot pass 

 through the cell-wall, they can be obtained free only by thorough destruction 

 and rupture of the cells. 



I. 21, for always read generally 



II. 23-4, delete The enzymes . . . alcohol. 



11. 26-8, for We may distinguish . . . limited read Hence it is possible to 

 classify enzymes according to the value of the effects they induce. Here we 

 shall deal only with the hydrolytic enzymes reserving other effects for treat- 

 ment later on, and we must recognize at least six groups of these enzymes : 



