224 BOTANICAL GAZETTE [SEPTEMBER 
The nucleus of Tradescantia appears to have a structure like protoplasm, 
but much more compact. 
Bending movements of Oscillaria are accompanied by wave-like movements 
of particles in the cells; and the longitudinal movements by a streaming of par- 
ticles on the surface in a direction opposite to that of the motion of the filament. 
These particles pass off into the water when they reach the end of the filament. 
Ultramicroscopic organisms in figure-of-8 forms, and colonies in form like 
certain flagellates, similar to the organisms already described by RAE HLMANN, 
to be, but is probably initiated by a complex motion of the siren 
particles (ultramicrons) of the protoplasm, whose structure seems identi 
with that of colloidal solutions as determined by ZsicMonpy with the instrument. 
The first movement, indeed, may be what has long been known as the Brownian 
movement, once so carefully distinguished from the ‘‘vital’? ones as “purely 
physical.” 
In plasmolysis GatpuKov has seen the protoplasmic particles move from 
the periphery toward the center of the cell, changing shape at the same time 
from round to vermicular, while in the chloroplast simultaneously the vermicular 
chlorophyll particles creep out upon the surface. In Flagellatae there is : 
vigorous movement of particles in the ‘em of the cilia and’ below the mout 
opening, before the gross movements begi . 
Whereas in chlorophyllose cells ms cell wall i is optically empty (leer), i 
one to see the cell contents clearly, the wall of bacteria and fungi has so scr 
a structure that nothing can be seen through it. Yet the purple bacteria pine 
also work photosynthesis have a wall optically empty. These facts are we ce 
to be related to the necessity for transparence to light in photosynthetic cells. 
[Bae ae | 8 
Araucarieae.—A. C. Sewarp and Srpitte O. Forp have published vad 
results of a study of the Araucarieae.© The two living genera representine 
the group, Agathis and Araucaria, have long stood somewhat stiflly apart 
other Coniferales, not only on account of the known facts in reference t re 
but chiefly, perhaps, on account of lack of knowledge. The authors mee 
shalled our knowledge of extinct and living forms in this memoir; and us 
opinions may differ as to their conclusions, there can be only one opinion 4 as 
the value of the work. The subject is presented under ms following © cal 
distribution, generic diagnosis, seedlings, stem anatomy, roots, leaves, ” 
traces, reproductive shoots, fossil Araucarieae, and phylogenetic consider but 
and conclusion, The details are too numerous to be included in 4 a reviews 
the conclusions are too important to be passed over lightly. 
xtinct 
6 Sewarp, A. C. and Forp, SrsttiE, O., The Araucarieae, recent _ 
Phil. Trans. Roy. Soc. London. B. 198 : 305-411. pls. 23-24. figs- 28. 1900. 
