16 Gen. Sub. 
GENERAL SUBJECTS. 
°Preyer, W. Zur Physiologie des Protoplasmas. Naturw. Woohenschr. 
vi, pp. 1-4, 27- 31, & 421-425. 
Ratii, 0. V. Ueber die Bedeutung der amitotischen Kerntheilung im 
Hoden. Zool. Anz. xiv, pp. 331, 332, 342, 343, & 355-363, 3 figs. 
In all cases in which amitotic division occurs in the testes, it is 
restricted to the marginal or supporting cells. The formation of sper- 
matozoa and the regeneration occur solely by mitosis. 
°Reinke, F. Untersuch ungen ueber das Yerhalten der von Arnold 
beschriebenen Kernformen zu Mitose und Amitose. Inaug. Diss. 
Kiel : 8vo, 14 pp. 
Ryder, J. A. On two new and undescribed Methods of Contractility 
manifested by Filaments of Protoplasm. P. Ac. Philad. 1891, pp. 
10 - 12 . 
In Vorticella there are unequally contracting discs fixed in a spiral 
manner ; in Trypanosoma balbiariu there is a rapid reversal of the spiral 
in a dextral or a sinistral direction. 
Schafer, E. A. On the Structure of Amoeboid Protoplasm, with a 
Comparison between the Nature of the Contractile Process in Amoe- 
boid Cells and in Muscular Tissue, and a Suggestion regarding the 
Mechanism of Ciliary Action. P. R. Soc. xlix, pp. 193-198. 
Spongioplasm is reticular, with an affinity for hyematoxylin ; hyalo- 
plasm is structureless and is chemically different. Hyaloplasm is the 
more active, and flows, e.#., in pseudopodia. A rhythmic flowing of 
hyaloplasm in and out of a hollow extension of a cell will explain the 
movement of a cilium. 
Sciiiefferdecker, P. [See Behrens, W.] 
Schneider, K. C. Untersuchungen fiber die Zelle. Arb. z. Inst. Wion, 
ix, pp. 179-224, 2 pis. 
. Ueber Zellstructuren. Zool. Anz. xiv, pp. 44-46, 49, & 50. 
Bars of nuclear framework are connected through the nuclear mem- 
brane with the protoplasmic framework. The framework consists of 
looped fibres of uniform thickness, which may unite with one another 
and form membranes. Nucleoli are aggregations of chromatin grains, 
and may be resolved into them again. The spindle-fibres are modified 
contractile bars of the framework. 
Schutzenberger, P. Essai sur la synthase des matures protdiques. 
C.R. cxii, pp. 198-201. 
Schwarz, E. Zur Theorie der Kernteilung. Arch. path. Anat. cxxiv, 
pp. 488-506, 9 figs. 
Solger, B. Zur Kenntnis der Pigmentzellen. Anat. Anz. vi, pp. 162- 
165, 2 figs. 
• . Ueber Pigmenteinschlfisse in der Attraktionaphare ruhender 
Chromatophoren. T. c. pp. 282-284, 2 figs. 
