TRANSACTIONS OF MICROSCOPICAL SOCIETY. 
DESCRIPTION OF PLATE IX, 
To illustrate Dr. Beale^s views upon tlie Formation of Bone 
Transactions/ p. 103), the changes occurring in "'Pro- 
toplasm'^ C^Mic. Journ./ p. 260), and the Structure of 
the so-called Unipolar Nerve-cells'^ from the Sympa- 
thetic Ganglia of the Frog ('Mic. Journ./ p. 304). 
Fig. 11. — Thin section of the frontal bone of the frog, showing the for- 
mation of four lacunae. 
rig. 12. — Two lacunse in a further stage of formation. The "canaliculi" 
commence at the intervals between the particles of calcareous matter depo- 
sited in matrix of the cartilage. 
rig. 13. — Two recently formed lacunae from the frontal bone of tiie frog. 
rig. 14. — A diagram showing the mass of germinal matter with calcareous 
particles deposited in the matrix around it. The author considers that 
masses of germinal matter existed in each of the spaces left in Mr. Rainey's 
figure (Plate VIII, fig. 9). 
Pig. 15. — Mucus-corpuscle from the mucus of the throat, showing the 
different forms it assumed within a minute. The nuclei are seen in the 
centre of the parent mass. Portions of this have moved aM^ay some dis- 
tance, and two are detached. These would grow and form new mucas- 
corpuscles. Nuclei might arise in the portions detached. The movements 
observed seem to be independent of the nucleus. The nature of these 
movements has not yet been explained, but Dr. Beale calls them "vital" 
movements. {See ' Mic. Journ.,' vol. iii, N. S., p. 260.) 
rig. 16.— A so-called " unipolar " nerve-cell, with, 1st, a straight, and 2nd, 
SiSpiralt^hve emanating from it. The fibres continuous with these are seen to 
pursue opposite directions. The straight fibre is continuous wir.h the central 
part of the material, of which the body of the " cell " is composed, and the 
spiral fibre with the peripheral part of the same. Both fibres are nucleated, 
and a large nucleus and nucleolus are seen in the upper part of the cell. 
The specimen from which this drawing was taken was coloured with car- 
mine. The nucleolus was most intensely coloured, then the matter around 
this (nucleus). The matter around the nucleus was paler, and that portion 
at the lower part of the cell which is gradually undergoing conversion into 
the "spiral fibre" was not coloured at all. The nerve-fibres were not 
coloured, but all the nuclei embedded in these fibres were darkly coloured. 
{See ' Mic. Journ./ vol. iii, N. S., p. 304.) 
