SPECIAL SUBJECTS. 
Gen. Sub. 21 
Hansemann, D. Ueber asymmetrische Zelltheilung in Epithel von 
Krebsen und deren biologische Bedeutung. Arch. path. Anat. cxix, 
pp. 299-320, 1 pi. 
Hartog, M. M. The State in which the Water exists in Live Proto- 
plasm. J. R. Micr. Soc. 1890, pp. 441 & 442; Rep. Brit. Ass. 1889. 
(1) Live protoplasm is transparent, and of low refractivity (/*<1.38); 
(2) Dead protoplasm is opaque from optical heterogeneity ; (3) The trans- 
parency of dead protoplasm is restored by replacing the liquid that per- 
meates it by a medium of higher refractive index ; (4) The substance so 
permeated is solid and of high refractivity >1.53) ; (5) In death the 
solid substance forms a sort of reticulum too fine for resolution by our 
microscopes, the interstices of which are permeated by the watery liquid ; 
in life, the two are combined in the form of a viscid liquid ; hence death 
is essentially a phenomenon of precipitation. 
*Heitzmann, C. La Constitution reconnue par l’Etat d’uneseule espece 
d'Eiements ou Plastides. J. Microgr. xiv, pp. 262-270. 
*Henneguy, L. F. Nouvelles recherches sur la Division des Cellules 
embryonnaires chez les Yertebres. CR. Soc. Biol, ii, pp. 444-446. 
Hermann, F. Die Enstehung der karyokinetischen Spindelfigur. 
Miinchener med. Wochenschr. xxxvii, pp. 830-831. 
Hertwig, O. Yergleich der Ei- und Samenbildung bei Nematoden. 
-Eine Grundlage fur cellulare Streitfragen. Arch. mikr. Anat. xxxvi, 
pp. 1-138, 4 pis. 
. Experimentelle Studion am tierischen Ei vor, wahrend, und nach 
der Befruchtung. Jen. Z. Nat. xxiv, pp. 268-313, 3 pis. 
Hofer, B. Experimentelle Untersuchungen fiber den Einfluss des Kerns 
auf das Protoplasma. T. c. pp. 105-176, 2 pis. 
Hoyer, H. Ueber ein ffir das Studium der “ direkten ’’ Kernteilung 
vorzfiglich geeignetes Objekt. Anat. Anz. v, pp. 26-29, 1 fig. 
Ova of Rhabdonema nigrovenosum. 
Kraft, H. Zur Physiologie des Flimmerepithels bei Wirbelthieren. 
Arch. ges. Phys. xlvii, pp. 196-235, 4 cuts. 
Leclercq, E. Contributions a l’dtude du Nebenkern ou Corpuscule 
Accessoire dans les Cellules. Bull. Ac. Belg. lx, pp. 137-148, cf. 
pp. 10-13. 
Leydig, F. Intra- und interzellulare Gange. Biol. Centralbl. x, pp. 
392-396. 
°L0wit, M. Ueber Amitose (direkte Teilung). Centralbl. f. allg. Pathol, 
i, pp. 281-286. 
Marshall, C. F. Observations on the Structure and Distribution of 
Striped and Unstriped Muscle in the Animal Kingdom, and a Theory 
of Muscular Contraction. Mem. Biol. Owens Coll, iii, pp. 73-101, 
1 pi. 
