JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATE XVIII, 



Illustrating Dr. Klein^s Memoir on the " Glandular Epi- 

 thelium and Division of Nuclei in the Skin of Newt.'' 



Pig. 1. — Part of a large saccular gland of tail of newt, a, epithelial cells 

 (nearest the duct) filled with fat globules ; b, epithelial cells, one part 

 of which contains large, highly refractive granules ; c, cells indicated 

 merely in outline. Drawn on Crouch's small stand, with his \ obj. 



Pigs. 2, 3, 4, 5, 6, and 7 represent giant nuclei of the epithelial cells lining 

 the above glands, examined fresh on the warm stage on Cruucii's 

 small staud with Zeiss'* E obj. 



Pigs. 4 and 7 represent nuclei in the stage of division. 



Pigs. 8 — 35 are nuclei of the deep layer of (columnar) epithelial cells of 

 the epidermis of the tail of newt. 



Pigs. 8 — 25 and Fig. 33 show the outlines only of the respective epithelial 

 cells. 



Pigs. 8 and 9 represent ripe nuclei, i. e. nuclei possessed of a limiting 

 membrane, a uniform dense network with dots (fibrils viewed in sec- 

 tion), and a pale, transparent interstitial substance. 



Pigs. 10, 11, 12, and 13 represent nuclei, in which the fibrils of the intra- 

 nuclear network become twisted and convoluted, and arranged more 

 or less in the shape of a ' basket.' The nuclear membrane has 

 become indistinct. 



Pigs. 14, 15, 16, 17, 18, and 19 represent nuclei, in which the fibrils have be 

 come so arranged that they are radiating towards the centre, ' wreath,' 

 and single star, monaster. A nuclear membrane is not present. 



Pigs. 20, 21, and 22 show nuclei, in which the network of fibrils has be- 

 come arranged as a double star, dyaster. The nuclear membrane 

 is not present. 



Pigs. 23, 24, and 25 show daughter nuclei, i. e. after the mother nucleus 

 has divided. 



Pigs. 8—15 and 18—25 drawn with Zeiss's E. 



Pigs. 16 and 17 with Zeiss's oil immersion, y\ obj. 



Pigs. 26 — 32 show nuclei, dividing by simple cleavage. 



Pigs. 33 — 35 show dividing nuclei, in which the network had arranged 

 itself as in the former cases when nuclei are going to divide after the 

 indirect fashion ; but the division is, after all, after the direct manner 

 of cleavage. 



Pigs. 26—35 drawn with Zeiss's E obj. 



