CELL AND PROTOPLASM. 
Gen. Sub. 13 
ButSCHLI, 0. Ueber die Struktur des Protoplasmas. Verb, deutscb. 
Zool. Ges. 1891, pp. 14-29. 
History of past opinions. Conceptions in the field at present as to 
reticular, fibrillar, emulsion-like, vacuolar or foam-like structure of proto- 
plasm. Arguments and observations in favour of the last. 
“Chun, C. Ueber die Bedeutung der direktenKernteilung. Schr. phys. 
okon. Ges. Kouigsberg, xxxi, pp. 16-18. 
Dekhuyzen, M. C. Ueber Mitosen in frei im Bindegewebe gelegenen 
Leukocyten. Anat. Anz. vi, pp. 220-223, 2 figs. 
Fayod, Y. Structure du Protoplasma vivant. Rev. Gen. Bot. iii, pp. 
193-228, 1 pi. 
Protoplasm consists of a reticulum of spiral fibrils. 
° . Dc l’absorption de bouillies do poudres insolubles par les 
tissus vcgdtaux et animaux comine unique moyon propre a d^mon- 
trer quo le protoplasme est un tissu geliforme dont les fibrilles 
ont une structure canaliculee et spiralee. C.R. Soc. Biol, iii, pp. 
875-879. 
“Fell, G. E. The Influence of Electricity on Protoplasm. P. Am. Soc. 
Micr, xii, pp. 1-34, 4 pis. 
Flemming, W. Ueber Theilung und Kernformen bei Leukocyten und 
fiber deren Attractionspharen. Arch. mikr. Anat. xxxvii, pp. 249- 
298, 2 pis. 
Leucocytos divido both with and without mitosis. They exhibit 
attraction-spheres and central corpuscles. Fragmentation of the nucleus, 
with or without division of the leucocyte, is a degeneration or aberration, 
or influences cellular metabolism by increasing the nuclear surface. 
. Neue Beitrage zur Kenntniss der Zelle. Theil n. T. c. pp. 685- 
751, 3 pis. 
Traces of a cell-plate occur in division. There is a change of the cell- 
substance during mitosis. The occurrence of attraction-spheres and 
central corpuscles in leucocytes. The spindle fibres are probably due to 
linin, and to the membrane of the nucleus, but are perhaps in part of 
double origin. The initial longitudinal splitting of the chromosomata 
cannot be referred to a mechanical pull exerted by spindle fibres. 
. Attraktionspharen und Centralkorper in Gewebzellen und Wander- 
zellen. Anat. Anz. vi, pp. 78-81, 5 figs. 
Attraction-spheres and central bodies in leucocytes of Salamandra , &c. 
Though rarely seen, these bodies are probably always present, oftener 
double than single. 
. Ueber Zellteilung. Verh. Anat. Ges. '5 Vers. 1891, pp. 125-144. 
Advances in our knowledge of cell-division since 1887. 
0 — — . Ueber Teilung von Leukocyten. Verh. x Internat. Med. Kongr. 
Berlin, ii, pp. 76-78. 
1891. [vol. xxviii.] b 5 
