DR. MARTIN BARRY ON FIBRE. 125 



Fig. 64. Muscle ; a, y, from the Lobster (after boiling) ; 5, from the Sheep, a, y. 

 Interlaced spirals, which are compound filaments. Their structure is 

 seen at |3. Dots represent the situation of longitudinal filaments, sur- 

 rounded by the spirals a, y. 8. Appearance inducing the belief that the 

 transverse striae cross the fasciculus in a continuous line, until the parts 

 are more minutely examined (see the objects a, y, and par. 120). 



Fig. 65. Tadpole, 8'". From the tail. Muscle-fasciculus more advanced than that 

 in fig. 94. It presents on one side four interlacing spirals ; each spiral 

 a compound object. Their contents not shown. 



Fig. 66. Young Crab. Two portions of a fasciculus of muscle : a. Contracted; and 

 (3, relaxed (see par. 52). The arrow shows the longitudinal direction 

 of the fasciculus. 



Fig. 67. Tadpole. Two portions of a fasciculus of muscle, a. The edges of four fila- 

 ments (" fibrillse") are seen, unchanged. (3. Extremity, elongated to a 

 point before being broken. In (3, the direction of the spirals is very 

 much altered. The upper part of ]3 may serve to convey an idea of the 

 state of a fasciculus in extreme relaxation (par. 51). |3 Appeared to be 

 invested by a highly elastic membrane (par. 54). The extreme point of 

 /3 was at the distance of -^j-'" from a. 



PLATE VIII. 



Fig. 68. Tadpole, 5^'". From the fail. Appearance near the surface of an object 

 such as the larger of those in fig. 73, after the addition of acetic acid of 

 the strength of distilled vinegar. The discs it presented (fig. 68) seem 

 to have been the essential part of spirals such as the larger of those in 

 fig. 73 ; the outer part of which had been removed by the acetic acid, 

 a. The discs seemed to be composed of minuter discs (par. 55). 



Fig. 69. Tadpole, about 5'". From the tail. Spirals detached from a fasciculus of 

 muscle ; in a quadruple coil (par. 80). 



Fig. 70. Tadpole, about 5'". From the tail. Spirals detached from a fasciculus of 

 muscle ; in a double coil (par. 80). 



Fig. 71. Strawberry (Fragaria vesca, LINN.). Spiral from the leaf-stalk. This spiral 

 is a compound object, containing filaments (" fibres") (par. 80). 



Fig. 72. Sheep. From the white substance of the cerebellum. A spiral filament, 

 a. Structure of this filament (par. 35). 



Fig. 73. Tadpole, 5^'". From the tail. Sketch of two sets of spirals ; several being 

 parallel in each. The spaces circumscribed by these spirals presented 

 discs ; and the spirals exhibited more or less distinct traces of discs in 

 their substance (par. 55). 



