670 
Facts and Observations. 
MODE OE GROWTH AND INCREASE OE MUSCULAR EiBRE. 
M. Budge, by a new method of dissection — which con- 
sists in dissolving out the areolar tissue between the fibres, 
so that the muscular fibres alone remain — has been able to 
follow out the different conditions of their development in 
animals of different sizes. He has satisfied himself that the 
increase of muscles arises both from augmentation in thick- 
ness and in length of each existing fibre, and also from the 
formation of new fibres ; and that under the influence of 
rest, or of absence of nutrition, the fibres diminish in 
volume, and that some of them disappear . — Academie des 
Science . 
STRUCTURE OE NERVES. 
“ M. Jacubowicht,” says M. Flourens, “has been 
enabled to separate the elementary structures of the three 
orders of nerves in nervous substances prepared by chromic 
acid. He has shown that the nervous filaments of movement 
end at last in the stellate nerve cells ; that the fusiform cells 
give off the nerves of sensation ; and that the filaments of the 
great sympathetic proceed from oval cells. Since this 
demonstration there has been much discussion among ana- 
tomists as to whether these elements are or are not enveloped 
in membranes. M. Jacubowicht has decided the question. 
When thin layers of nervous matter are soaked in an 
aqueous solution of carmine, the nervous elements are seen 
to take a rose tint in a very short space of time ; and what is 
remarkable, is that the cells themselves become coloured, 
but not the membrane which encloses them. Hence then 
its existence cannot be doubted. The same preparation 
applied to nervous filaments shows that they also are con- 
tained in a membrane. M. Jacubowicht has also discovered 
that the fusiform cells — the origin of nerves of sensibility — 
send small prolongations to the stellate cells of movement. — 
Acad, des Sciences. 
