ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 297 



Structure and Regeneration of Poison Glands of Plethodon 

 oregonensis.* — C. 0. Esterly finds that the skin glands of this newt are 

 of two kinds, as in most amphibians, namely granular and mucous. 

 The granule glands are larger than the mucous glands, have an investing 

 musculature, and are poisonous. They are destroyed in the process of 

 secretion, and renewal takes place by the growth into all the old 

 glands of a new and smaller gland, which is mucous in character. The 

 growth of the new gland is dependent upon the removal of the secretion 

 about it. There is evidence that even when hindered in their develop- 

 ment, they still secrete mucus, and a primordium giving the mucous 

 reaction is found in all glands whether degenerate or not. When not 

 hemmed in by the heavy granular contents of the large glands, the new 

 glands grow and replace the old glands, probably assuming their 

 function. 



Both the musculature and the epithelium of the granule glands have 

 a direct nerve supply. The gland cells are surrounded by a basket-work 

 of fibres, which in some cases have terminal expansions lying on the 

 nuclei. The muscles are supplied by nerves with typical endings in the 

 form of expansions or bulbs, as well as by fine twigs without terminal 

 expansions. 



Intranuclear Pat in the Supra-renals of Mammals.t — P. Mulon 

 finds in some mammals, e.g. guinea-pig and dog, both young and adult, 

 that the nuclei of the cells of the cortical substance show fatty inclusions. 

 The nuclei are quite normal in form and as to their chromatin. The 

 presence of fat in the nuclei, i.e. in a phosphatic environment, is the 

 more remarkable, since the cytoplasm of these glandular cells contains a 

 lecithin. The presence of inclusions of the same chemical nature in the 

 nucleus and in the cytoplasm of secreting cells suggests that the nucleus 

 has an active role in the secretory process. 



Supra-renal Capsules 4 — Rivas Mateos, C. Calleja, and R. Folch 

 give a summary account of their observations on the minute structure of 

 the supra-renal capsules in mammals, discussing in order the connective- 

 tissue zone, the cortical zone, and the medullary zone. 



Heart Muscle of Dog.§ — Gertrude A. Gillmore finds that in the dog's 

 heart the fibres are packed closely together. Fibrils from adjacent cells 

 blend together to form new fibres. Along the edge of the fibres there 

 is a narrow wavy condensation of sarcoplasm resembling the sarcolemma 

 of insect muscle. In this structure Krause's membrane terminates. 

 Numerous other details of structure are discussed in the paper. 



c General. 



Pelagic Cephalochordates.|] — R. Goldschraidt obtained from the 

 * Yaldivia' collection 26 specimens of pelagic Cephalochordates captured 



* Univ. California Publications (Zoology) i., No. 7 (1904) pp. 227-63 (4 pla.). 



t Comptes Eendus, cxxxix. (1904) pp. 1228-30. 



X Boll. Soc. Espafi. Hist. Nat., iv. (1904) pp. 262-4. 



S Trans. Amer. Micr. Soc, xxv. (1904) pp. 35-44 (3 pis.). 



|| Biol. Centralbl., xxv. (1905) pp. 235-40 (1 fig.). 



