The Movement of Protoplasm in Coenocytic 
Hyphae \ 
BY 
J. C. ARTHUR, 
Purdue University , Lafayette , Indiana. 
With Woodcuts 8, 9, 10, 11. 
HE translational movement of protoplasm varies much 
I. in the manner of its appearance, but for the most part 
may be considered under three headings : viz. circulation, 
as in the staminal hairs of Tradescantia ; rotation, as in cells 
of Chara ; and streaming, as in plasmodium of Myxogastres. 
There is, beside, the sliding movement seen in Desmids, and 
the pulsating movement of many locomotive organisms, and 
others less common. All these are undoubtedly spontaneous 
movements, and together with such induced movements as 
the orientation of chlorophyll-grains in leaf-cells of Oxalis 
and Lemna and in filaments of Mesocarpus and Caulerpa , when 
acted upon by light, are probably conditional upon some 
property of living matter not yet understood, which acting 
under diverse conditions brings about different manifestations 
of energy. 
Of the several forms of movement, streaming is most pro- 
nounced, as the mass involved is larger and the speed 
1 Read before the Botanical Society of America at the Toronto Meeting, 
August 1 8, 1897. 
[Annals of Botany, Vol. XI. No. XLIV. December, 1897. 1 
L 1 
