496 
MR. BOWMAN ON THE MINUTE STRUCTURE AND 
Fig. 13. Fragment of a fibrilla from the upper part of the oesophagus of the same. 
Fig. 14. Primitive component segments of a primitive fasciculus, arranged so as to 
form longitudinal and transverse striae, very highly magnified to show the 
long diameter of the segments oblique to these striae, and turned in dif- 
ferent directions, so that the transverse striae are broken. From the leg 
of a Chameleon in spirit. 
Fig. 15. Four primitive component segments of a fasciculus, united longitudinally 
to form a fragment of a fibrilla. Very highly magnified, and in two 
states of focus, to show their form and density by the varying refraction 
in the two states. By the lateral adaptation of a series of fibrillae such 
as this, the transverse striae would be doubled in one state of focus. From 
the psoas muscle of the Hare. 
Fig. 16. Several primitive fasciculi from the leg of a Rabbit at birth, macerated seve- 
ral months in weak spirit. On the convexity of the curve many segments 
of the fibrillae are deficient, and the lateral adhesion of the remaining 
ones is thus made evident. 
Fig. 1/. Three fragments of a macerated heart (Ox), showing everywhere marked 
fibrillae, and their union to form striae. 
Fig. 18. Two fibrillae from a Crab, showing the segments aggregated into sets of 
three, and thus producing broader and less numerous striae. 
Fig. 19. Primitive fasciculus from the neck of the Duck in two states of focus. 
At a the striae are seven in x^o^ 1 °f an inch, and at b. twenty-one to 
twenty-five in the same space. The striae are oblique, by the discs being 
thrown, as it were, partially on their sides. 
Fig. 20. Unusual appearance of the striae in a fasciculus of the Staghorn Beetle, 
observed immediately after death. 
Fig. 21. Portion of a primitive fasciculus from a Pig, showing a cleavage according 
to the transverse striae. 
Fig. 22. Human primitive fasciculi, in which the transverse striae are separated. 
The irregularities are due to the pressure of a lamina of mica. 
PLATE XVII. 
Figs. 23. 24. 25. 26. Portions of primitive fasciculi from the leg of a Lizard that 
had been kept in spirit, in which all appearance of longitudinal striae is 
absent, and the cleavage is into discs. 
Fig. 2 7- Two recent primitive fasciculi from a Sprat, showing the same points. 
One disc is seen detached. 
Fig. 28. Primitive fasciculus from an atrophied gastrocnemius muscle (human), 
showing the angularity of the striae. 
Fig. 29. Part of a primitive fasciculus from the Boa, showing a partial separa- 
tion of the discs and the untorn sarcolemma between them. 
