24 THE MINUTE STRUCTURE OF INVOLUNTARY MUSCULAR FIBRE 
EXPLANATION OF PLATE II 
Fig. 1 represents part of a fibre-cell from the pig’s intestine, drawn out into a very fine thread. 
and 3, fibre-cells from the same situation, considerably extended. 
Figs. 2 
Fig. 4, fibre-cells exhibiting faint longitudinal striation. 
Figs. 5, 6, and 7, fibre-cells imperfectly contracted. 
8 and 9, small fibre-cells considerably contracted. 
IO, II, 12, 13, 14 and 15, fibre-cells extremely contracted. 
16, a fibre-cell curled up, showing the position of the nucleus embedded in its substance. 
17, part of a moderately contracted fasciculus of unstriped muscle from the pig’s intestine, 
as seen under a rather low magnifying power. 
Fig. 18, a small artery from the frog’s web, under a rather low magnifying power. 
Fig. 19, part of the same vessel highly magnified, showing the spiral arrangement of the muscular 
fibre-cells. 
Figs. 20 and 21, muscular fibre-cells from another artery. In Fig. 20, the spirals are much closer 
than in Fig. 19; and in Fig. 21, the spiral is quite close. 
Figs. 22 and 23 represent some fibre-cells in arteries of extreme minuteness, and show the section 
of the nucleus surrounded by that of the fibre-cell. 
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