PROTOPLASM AMD THE CELL. Gen. Sub. 47 
Microscopic changes in nerve-cells after stimulation ; Hodge (246), 
Mann (325). 
Contraction in Pelomyxa ; Israel (258). 
c. Nucleus , Nucleolus , Gentrosomata. 
Nuclear structure : The linin is the nuclear plasma, web-like or foatn- 
like, owing to the granules of chromatin and oedematin embedded in it ; 
Beinke (444). 
Chromatophilous character of nucleus ; Bosen (459). 
Shapes of nuclei : Peculiar lobed shape of nuclei in some of the 
epithelial cells of larval Salamander appears to be associated with the 
last stage of mitosis, during the reconstruction of daughter-nuclei; Van 
der Stricht (524). 
Structure of the nucleus : A fundamental substance (linin) with 
spherules (microsomes) imbedded in it. Oxy chromatin and basi- 
chromatin distinguished ; Heideniiain (225). 
Function of the nucleus ; Zimmermann (594). 
Orientation of nucleoli in motor nerve-cells ; Magini (323). 
The microcentrum includes the achromatin substance in the centre 
of the astrosphere, the centrosomes and any accessory corpuscles ; 
Heidenhain (225). 
The archoplasm : This is no substance of specific quality, but part of 
the cyto-mitome ; Heideniiain (225). 
Astrosphere : This is a topographical conception, no definite organ. It 
owes its origin to the fact that the inner ends of the threads of a centered 
system are secondarily defined off from the rest of the cell by the appear- 
ance of a granular zone; Heideniiain (225). 
Belative positions of microcentrum, nucleus, and plasma-masses, and 
the polymorphism of the nucleus are interpretable in term3 of varying 
teusion in the mitome ; Heideniiain (225, 227). 
Annular nuclei and their attraction-spheres ; Meves (350). 
Metamorphosis of attraction-sphere in spermatogonia of Salamander ; 
Meves (348). 
Attraction-spheres are not more than local differences in the plasmic 
texture defined by their relations to other parts ; they have no bio- 
chemical peculiarities nor morphological definiteness, are very variable, 
and can be mimicked in Biitschli’s emulsion ; Eismond (140). 
Morphological value of the attraction-sphere : In tissue cells, the archo- 
plasm is not always present, nor is it necessarily persistent through suc- 
cessive cellular generations. The only persistent portion is the centro- 
some, which perhaps owes its importance merely to the fact that it lies 
in the foci of forces which divide the cell. Consideration of the various 
modifications of the attraction-spheres, and inquiry as to their meaning ; 
Moore (368). 
Number of chromosomes in cells : Though each species has probably 
a typically constant number of chromosomes (Flemming, Babl), the 
