SUPPLEMENT 85 



character of embryonic substance to all protoplasm. It is a well-known fact 

 that continuity of the plasma exists, and that protoplasm arises only from pre- 

 existing protoplasm ; hence we will do better to draw another conclusion from 

 the facts mentioned above, a conclusion which we may formulate by saying 

 that protoplasm may exist in two conditions, one with a capacity for growth, 

 the other without, in other words ' embryonic ' and ' somatic ' protoplasm, and 

 further, that not only can the embryonic condition change into the somatic, but 

 that the somatic state can become embryonic (comp. however, NOLL, 1903). 



285. Lecture XXIII is divided in the 2nd German Edition into two lectures, of 

 which one, Lecture XXII, has the title EXTENSION and includes to p. 295. 



1. 48, for frequently exhibit, at a certain distance read begin to exhibit only 

 at a considerable distance 



P. 286, 11. 38-9, for but varies . . . manner read but takes place in a special 

 manner, 



288, 11. 10-11, for each . . . apart read at intervals of I mm. 



289, 1. 41, after growth add in length, 

 1. 49, after aerial insert roots 



290, 11. 2-3, for increases . . . one hour : read hourly increments of growth : 



1. 15, after bud read (comp. BERTHOLD, 1904). 



1. 19, for elongation read expansion 



1. 23, for growth in length read expansion 



1. 42, after period read and that the growth of the shoot, as a whole, shows 

 the same thing. 



1. 43 P. 291, 1. 2, for Let us now compare . . . growth in it. read Fig. 

 85a shows graphically the grand period in the development of the shoot of 

 Fritillaria, but it also shows that it is by no means essential that the growth 

 should always take place in this way. For example, the flower scape of 

 Taraxacum (MiYAKE, 1904), which certainly is composed of one internode only, 

 shows two grand periods of growth, separated by a retardation period which 

 occurs at the flowering stage ; when fruit formation begins, renewed growth 

 in the scape takes place. A strikingly analogous instance to this is exhibited 

 by the unicellular sporangiophore of Phycomyces (ERRERA, 1884), which, when 

 the sporangium begins to form, stops growing, but enters on another grand 

 period afterwards, which is characterized by much more prominent elongation 

 than the first. 



\Vhen we compare such examples with a leafy tree, such as the horse- 

 chestnut, we find in the axes of its buds as many growing zones as there are 

 internodes, separated by nodes which grow by little or not at all. Each indivi- 

 dual internode goes through its own grand period, but as to how growth is 

 distributed in it, but little is known. 



Fig. 85a. Graphic representation of growth in the scape of Taraxacum (after MIYAKE, 

 1904) ; and of Fritillaria (after SACHS, 1872). The abscissa indicates days, the ordinates 

 the daily increment in growth in mm. 



293, 1. 39, for There . . . where, read In the more vigorous at least of the 

 cases mentioned 



1. 42, for cannot be expressed read is not given. 



1. 44, for for read therefore 



1. 45, for work out read express 



294, 1. 7, for If . . . may read Only if we know further the duration of 

 growth can we 



1. 39, for all cells, which read all living cells, especially parenchyma, which 



