492 Arthur . — The Movement of 
greater. Its discovery in hyphae is therefore of considerable 
interest. So far as I know, literature shows but few refer- 
ences to the streaming movement of protoplasm in hyphae. 
One occurs in Vines’ ‘Textbook of Botany’ (1895), where 
(p. 735) it is cited in a general way as one of the several 
instances of protoplasmic movement ; and on the following 
page the direction of such movement is said to be various, 
except ‘ in plasmodia and in hyphae,’ where it is a ‘ simple 
longitudinal movement.’ A more definite account of the 
movement in hyphae is given by De Vries 1 in the Botanische 
Zeitung for 1885, in the case of the sporangiophores of 
Phycomyces. At the time of spore-formation the contents of 
the sporangiophores of this species appear to pass into the 
sporangia. The sporangiophores are very long, occasionally 
exceeding 30 cm., and unusually thick, and movement within 
them can be easily observed. De Vries appears to have 
considered this a special instance of protoplasmic movement, 
clearly designed for rapid supply of water and nutriment 
to the forming sporangia and not necessarily of the same 
nature as the movement in Tradescantia and the Myxo- 
gastres 2 . This interpretation is strengthened by the fact 
that he makes no reference to it in the revised edition of his 
Leerboek der Plantenphysiologie , issued a few months later, 
although eight pages are given to a careful presentation of 
protoplasmic movement. 
1 De Vries, Hugo, ‘ Ueber die Bedeutung der Circulation und der Rotation des 
Protoplasma fur den Stofftransport in der Pflanze.’ — Bot. Zeit., 43 : 1-6, 16-26. 
2 De Vries’ words are as follows : — ‘ Betrachten wir zunachst einen besonderen 
Fall, in welchem die Bedeutung der Bewegung des Protoplasma fiir den Stoff- 
transport klar zu Tage tritt. In den Fruchttr'agern von Phycomyces nitens bewegt 
sich das Protoplasma von einem Ende bis zum anderen mit einer solchen 
Geschwindigkeit, dass die ganze Lange des Fruchttragers von den einzelnen 
Theilchen des lebendigen Inhaltes in wenigen Stunden durchlaufen wird.’ — 
1. c. page 4. 
‘ Es ist klar, dass in manchen Fallen nicht nur die eigentlichen NahrstofFe, 
sondern auch das Wasser, nur durch die Stromung des Protoplasma in geniigender 
Weise transportirt werden kann. Solches gilt u. A. offenbar von den Frucht- 
tragern von Phycomyces und den Wurzelhaaren der hoheren Pflanzen.’ — 1 . c. 
pp. 25-26. 
