EXPLANATION OF PLATE \Nl—Conlitu!rd. 



Fig. 17, a and b. — Two unstriped muscle-fibres. The intranuclear 

 Detwork of fibrils is well seen ; these are in connection with fibrils of 

 the substance of the muscle-fibre; there are seen numerous transverse 

 niarkinfjs alons almost the whole length of the muscle-fibre. That these 

 transverse markings, corresponding to rings which constitute the cortical 

 part, i. e. the sheath, is well shown in c, d, and e. 



Yu,. 18. — A non-meduUated nerve-fibre of mesentery of newt ; the 

 nerve-fibre has a delicate sheath, the nuclei of which contain a distinct 

 network of fibrils. 



Fig. 19. — Two connective-tissue corpuscles seen side-ways. The 

 nucleus contains a network of fibrils, in connection with that of the 

 cell-substance. 



Fig. 20 and 21.— Two migratory cells; 20, a common pale one, 21, a 

 coarsely granular one. Their nucleus shows the network of fibrils 

 very well. 



Fig. 22. — A csecal dilatation of a lymphatic vessel of the same mem- 

 brane, showing the nuclei of the endothelial cells forming the wall of 

 the lymphatic, and also nuclei of lymph-corpuscles. 



Fig. 23. a and c. — Two connective-tissue corpuscles ; the distinction 

 between 'ground-plate' and 'fibrillar substance' is well shown; the 

 ' fibrillar substance ' is in connection with the intranuclear fibrils. 



i, a nucleated plate ensheathing a minute non-medullated nerve-fibre. 

 The intranuclear network is seen in connection with the processes and 

 fibrils of the connective-tissue corpuscle c. 



