HISTOLOGICAL NOTES, 233 
consequently of the above-named short and fine cilia, or of 
the movement of these latter nothing could be seen. 
II. Teasing out fresh muscular tissue of the heart of the 
mouse, isolated fibrille of the fibres can be obtained; they 
(fibrille) appear of a regular moniliform character, so 
that they resemble a chain of large micrococci; and indeed 
I had at first taken them for such, having by accident found 
them in a drop of blood drawn from the ventricle of the 
heart by a capillary tube that had been pierced through the 
wall of the ventricle. On looking, however, through the 
same blood preparation I met, besides the above isolated 
ones, two, three, and more such chains joined together szde- 
ways, up to whole muscular fibres; so that about their 
nature, viz. as primitive fibrille of muscular fibres, there 
could be’no doubt. Now, the interesting fact that could be 
made out here was this: passing from a single isolated 
fibrilla to bits of muscular fibres composed of two, three, and 
more such fibrilla, the transverse striation of these several 
bits of muscular fibres was unmistakably due to the 
moniliform nature of the fibrillz, that is to say, correspond- 
ing to the varicosities of the fibrille were the dark trans- 
verse stripes, while corresponding to the parts between the 
varicosities were the light transverse stripes, or in other 
words, the dark stripes were made up of the varicosities, the 
light stripes of the intervening constricted portions of the 
fibrille. This is, I think, a strong corroboration of Dr. 
Haycraft’s view on the cause of the cross striation in mus- 
cular fibres, as described minutely by him in this number of 
the journal. 
VOL, XXI.—NEW SER, Q 
