298 Kuntze, Ueber Puccinia und betreffende Magnus'sche Einwände^ j 



i 



of Institute. In both instances as well as in others tlie raidribs 

 were examined microscopically and found to be entirely dead. i 

 A comparison of the results recorded shows that transmission ; 

 through dead portions of midribs was much more difficult to \ 

 accomplish than through girdied members. j 



In the conclusions to the previous paper I have said^) 

 „Impulses may be transmitted hy Mlmosa and Oxalis through dead , 

 portions of stems and petioles in which the conditions are such j 

 that a transmission by the cell wall, or the water in the cell wall j 

 only are possible, — It is to be noted however that while it is ; 

 proven that an Impulse may be transmitted by a wall of a dead [ 

 cell, it does not follow that the entire transmission from the point | 

 reception to the motor organ is accomplished by this means alone. 

 It seems quite possible that protoplasmic action plays a part at 

 both ends of the chain connecting the two points, and that while 

 hydrostatic disturbance does not constitute an Impulse, it may play 

 a minor part in the its transmission." 



Professor Haberlandt makes no attempt to explain the 

 discrepancy between my previousy published results and bis own, 

 and in fact my paper seems to have escaped his attention. The 

 writer is wholly unable to account for the difFerences in the 

 reactions obtained. It is to be said that the experimental plants 

 used by Professor Haberlandt in the Botanic Garden at Java 

 were perhaps unter more natural conditions, but those grown 

 at Leipzig were fairly normal as may be seen from the following 

 data obtained as to the rate of transmission of impulses in the 

 midrib of the leaf. 



June 19. 2 to 3 P. M. In greenhouse. Air teraperature 

 24 o C. Impulses given by a snip of the forceps to the apical 

 leaflets traversed the midrib in the periods : 50 mm in 45 seconds, 

 55 mm in 45 seconds, 55 mm in 40 seconds, 50 mm in 40 seconds 

 in young leaves, and 55 mm in 65 seconds, 55 mm in 50 seconds, 

 50 mm in 60 seconds, and 45 mm in 90 seconds in old mature 

 leaves. This gives a rate of. 5 to 1,25 mm per second, but 

 Professor Haberlandt does not state the temperatures at which 

 his results were obtained no direct comparisons can be made. 



LFeber Puccinia und betreffende Magnus'sche Einwände. 



\'ou 



Otto Kuntze. 



Es ist erfreulich, dass ein bewährter Mycolog, wie Professor 

 Paul Magnus, sich bestrebt, die Nomenclatur der Pilze nach 

 dem Pariser Codex von Fall zu Fall zu prüfen und anzuerkennen. 

 Bisher herrschen bei neueren jMycologen insofern geradezu er- 

 schreckliche Zustände und Willkürlichkeiten. Fehlten doch in 



') 1. c. p. 299. 



