MOVEMENTS OF VOLUNTARY MUSCLE. 
497 
Fig. 30. Primitive fasciculus from the pectoralis major of a human foetus at birth, 
showing a partial separation of the discs (which are proved by the trans- 
verse strise to be already formed), and the sarcolemma in the interval. 
Fig. 31. Primitive fasciculus partially drawn from its sheath. From the Cod, mag- 
nified sixty diameters. 
Fig. 32. Broken primitive fasciculus from the Boa, showing a loose fragment in 
the tubular sheath connecting the detached portions. 
Fig. 33. Primitive fasciculus fractured, the ends drawn asunder, but retained in 
connexion by the sarcolemma, which is twisted. The ends of the frag- 
ments are somewhat rounded by it. From the Boa. 
Fig. 34. Primitive fasciculus (human), broken according to the discs, and the frag- 
ments connected by the untorn sheath. 
Fig. 35. Broken primitive fasciculus from the Frog, showing the tubular sarcolemma 
connecting the fragments, in a flaccid or collapsed state, and thrown into 
irregular folds. 
Fig. 36. Primitive fasciculus broken, by stretching, into several fragments, all of 
which are still contained in the untorn sheath. Magnified twenty dia- 
meters. From the Skate. 
Fig. 37- Primitive fasciculus partially broken up by its own inordinate contraction 
into its component segments. The debris all contained in the unmutilated 
sheath. Corpuscles are seen on some fragments. From the Frog. 
Fig. 38 1, 2, 3. Gradational appearance of disturbances of the striae from dis- 
union of the primitive component segments of the fasciculus, the parts 
retained in contact by the sheath. From the Skate. Magnified 100 
diameters. 
Fig. 39. Part of a primitive fasciculus of a Skate, swollen by liquor potassae, showing 
a hernia through a ruptured aperture in the sarcolemma. In this hernia 
the striae are distorted and variously curved. The corpuscles are elon- 
gated in the direction of the fibrillae, and indicate the direction taken by 
the particles of the protruding mass. Detached corpuscles are repre- 
sented with their nucleoli (a). 
Fig. 40. A similar specimen from the human subject, swollen by phosphoric acid. 
The herniae are seen more completely in profile. The corpuscles are less 
elongated, but some have nucleoli (a). Their average diameter is a oVd th 
of an inch. 
Fig. 41. Sarcolemma occupied by Trichinae. From the Eel. 
Fig. 42. Trichina extruded from the sheath, and uncoiled, showing an appearance 
of granules. This is ^A-th of an inch long. 
Fig. 43. Another extruded worm, coiled. 
Figg. 44 and 45. Granular mass, likewise extruded; 45. has the appearance of a 
transparent investment. 
3 s 
MDCCCXL. 
