96 Reviews and Records in Anatomy and Physiology. 
time very fragile, for, with light pressure, they immediately break 
up into discs or small regularly-shaped particles. This fracture 
is very uniform, and the resultant particles are of such a complete 
character in themselves, that they may be studied as distinct ob- 
jects exactly as blood-discs or other organic particles. Observed 
with a power of 1000 or 1200 diameters these separated atoms 
preset a regularity of form, shape, and size, fully indicating that 
they are special formations, in contradistinction to the view that 
they are the results of a systematic although accidental fracture 
of a homogeneous cylinder or band.* From these exatninations 
formations. ‘The phenomena observed in the muscles of many 
of the Articulata and especially those to which we have already 
we 
referred, seem to admit of no other construction. Again, 
have seen no evidence that, as Carpenter and Sharpey have ad- 
mined. 
If the best examples of muscular tissue in the form of fibrille 
are examined,—for instance, specimens from the thorax of the mus 
quito,—there may often be observed, besides the spiral-like arrange- 
* Leydig has described and figured this separation into discs of the muscular- 
fibrille, as occurring in Branchipus. His ot tions in thi t these Ento- 
mostraca correspond closely with our ‘own upon many of the Insecta. Se Ueber 
ei 
and so arranged 
ee ioe 1 tara see loc. cit. Taf viii, fig, 6. 
ee Carpenter, Princip. of Human Physiol., Amer. 1858, p. harpey; 
Quains Elements of ‘aii 5th ed. ii, p. 168. ‘ = eee ' 
