ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 27 



They are not endogenous, but exogenous in origin, representing the 

 terminal branches of processes from the adjacent Korbzellen and centro- 

 acinous cells. 



Criticism of Theories of Nuclear Structure.* — K. Tellyesniczky 

 points out that the visible structural complexities which have been de- 

 scribed in the nucleus do not in all probability correspond to the living 

 reality. There is no structural theory that helps much in the interpre- 

 tation of nuclear division and other activities. He discusses particular 

 structures — lanthanin, linin, and so on— in relation to the effect of 

 different reagents. 



Structure of Cartilage-Cells.f — A. Pensa has demonstrated on the 

 cartilage-cells (i.e. of guinea-pig), a body like a centrosphere (with one 

 centrosome or more), and a reticular apparatus which is in apparently 

 direct relation therewith. 



Nuclear Changes in Striped Muscle-Cell of Necturus.f — A. C. 

 Eycleshymer gives a preliminary account of remarkable changes in 

 quantity, quality, and distribution of chromatin during the various 

 phases of cytoplasmic differentiation. He emphasises the apparent 

 correlation of the nuclear changes with phases of cytoplasmic activity. 

 He asks if the nucleus of the muscle-cell, like that of the gland-cell, 

 builds up and gives off chromatin material which plays an important 

 role in cytoplasmic metabolism, and suggests that the dark band of the 

 muscle-fibril may be derived from nuclear chromatin. 



Endings of Nerves in Salivary Glands. § — A. Pensa finds that the 

 nerves going to the salivary glands in cat, rabbit, &c. end in an endo- 

 cellular reticulum. 



Muscular Terminations of Nerve-Fibres. || — A. Perroncito makes 

 another contribution to this much discussed subject. He describes, 

 especially in reference to human muscle, the ultimate terminations of the 

 motor fibrils in relation to the muscular tissue. 



Formation of Zymogen in Gastric Glands of Adder. % — L. Launoy 

 finds that the formation of zymogen in the granular gastric cells is quite 

 independent of reflex or mechanical stimulus, and may even occur when 

 the digestive canal has been for a long time in a resting state during 

 fasting. The elaboration of the zymogen-granules is endonucleolar. 

 The transformation of the zymogen into ferment is accomplished in the 

 cytoplasm, and this part of the procedure is reflex — depending on the 

 mechanical, physical, or chemical stimuli which act upon the cells. 



Femoral Glands of Lizards.** — Fr. Schaefer gives a detailed account 

 of the occurrence and structure of the femoral glands in Lacertilia. The 

 secretion which protrudes from the glands consists of cornified or partly 

 cornified stuff in Lacerta and Acanthodactylus ; in Sceleporits acmihinus. 



* Arch. Mikr. Anat , lx. (1902) pp. 681-706. 



t Rend. R. 1st. Lombardo, xxxiv. (1901) pp. 443-7. 



X Anat. Anzeig., xxi. (1902) pp. 379-85 (3 figs.). 



§ Rend. R. 1st. Lombardo, xxxiv. (1901) pp. 362-8 (1 pi.). 



II Tom. cit., pp. 164-70 (4 figs.). 



«jf Comptes Rendus, cxxxv. (1902) pp. 195-7. 



** Arch. Naturges., lxviii. (1902) pp. 27-64 (2 pis.). 



