122 DR. MARTIN BARRY ON FIBRE. 



Fig. 31. Tadpole, 4'". From the tail. Compound discs resembling those in figs. 

 29 and 30. The adjacent ones seemed to have united at a certain part, 

 so as to produce a spiral form. The two bodies in this figure appear to 

 be two columns such as those in fig. 30 (par. 42). 



Fig. 32. Tadpole, 5'". From the tail. Tubes the parietes of which consist of spirals, 

 forming out of discs such as those in fig. 31 (par. 42). 



Fig. 33. Tadpole. From the tail. More advanced stage of the same kind of tubes 

 (par. 42). 



Fig. 34. Mould, found on the left auricle of a sheep, several days dead. It is almost 

 entirely in outline. The figure represents two parallel and contiguous 

 tubes ; each tube lined by what appeared to be smaller tubes. The divi- 

 sions between the latter are shown by dots. Within the larger tubes, there 

 were highly refracting globules (see the figure), varying much in size, 

 and some of them, when first seen, were easily moved in the longitudinal 

 direction of the tube. They probably were contained in a fluid. Within 

 the smaller tubes on the left hand, were seen either rows of discs (y), or 

 filaments ((3). The smaller tubes on the right hand (a) presented a central 

 cavity ; these being probably more advanced than the tubes at j3 and y. 



PLATE VII. 



This Plate represents the Formation of Muscle. 



Figs. 35 to 44. Chick in ovo ; incubated twelve days. Early stages in the formation 



of muscle, from various parts of the body. Very much in outline. 

 Fig. 35. There are seen parietal nuclei, with orifices in them : these orifices 

 corresponding to the "nucleoli" of authors. At a, the discs are 

 arranging themselves in a spiral form even around the orifice, i. e. as 

 soon as formed. A large spiral invests the whole. 



Fig. 36. The figure represents the central part of a tube (a) and a spiral (|3). At 

 the outer part, in a, are longitudinal filaments. The spiral (3 sur- 

 rounded these filaments. The inner part of a is occupied by cells. 

 Each cell has a highly refracting nucleus, and is filled with discs. 

 The nucleus in each cell has an orifice ("nucleolus"). 

 Fig. 37. Mere outline. The nuclei have positions different from those of the 



nuclei in fig. 36. 



Fig. 38. Some of the filaments contained in the tube present their edges, others 

 their flat surfaces to the observer. In the middle of the tube there 

 are nuclei, small and in near approximation. The tube is flat. 

 Fig. 39. a. Spiral filament. (3. Longitudinal filament ; parallel to which, are 

 others of the same kind in outline, y. Nucleus divided into several 

 parts (discs). 



