REGENERATION OF LOST ORGANS. 121 
This may be seen in the series of figures 82, 83, 85. At first the cupola 
and the cavity beneath are large (Figs. 82, 88), but as the tissues that fill 
the cavity decay and disappear they diminish more and more (Figs. 85, 86), 
shrinking gradually towards the base of the joint. 
The tissue of the matrix is only atrophied in part; really, it is in those 
parts which converge above the cavity of the joint at the summit of the 
cupola, that is to say, where the amputation has produced a rent, that one 
observes the regeneration of the fatty tissue. The deep regular cells seen at 
the junction (Mtx) entirely disappear, and also afterward the part contiguous 
to the matrix. 
The red blood cells, after part of them have been regenerated and given 
birth to the cicatrix, dis- 
pose themselves in different 
parts of the joint. They 
glide between the fibres of 
muscles and into the clefts 
which are formed by their 
gradual bending. 
Red The orifice form- 
aan. ed after the oper- 
ells. J 
ation at the sum- 
mit of the joint between the 
fragments of the matrix 
(Fig. 84, O), in spite of the 
gradual approximation of 
the extremities of the ma- 
trix (Figs. 85, 86, O), re- 
mains open. In the degree 
that the summit of the 
cupola sinks the orifice 
becomes narrower, which, 
however, does not hinder 
the blood cells from pen- Fic. 83. A transverse section of the stump of a foot eighteen days after 
ener amputation; Mt.r, place in the matrix where the regeneration of 
etrating thereby from the grease is seen; Ms, muscles; gl.g, globules of grease; p.g, portions 
lower part of the cavity of of grease ; pt. 1, part of the new formed foot next the base; pt. 3, 
Haas . extremity of the same; pt. 2, part between the above two; Ms.n, 
the Joint (Figs. 85, 86, A) muscles of the new formation; ct.n, cuticle of same; chg.n, chi- 
into the upper part situ-  tinous layer of same; ¢c.am, free nuclei of red blood cells; ¢.sa, 
ate d above the cupola (Figs. amceboid blood cells; cj, color cells. 
85, 86, B), to contribute to the work of nourishing the new limb. It is 
only when the new organ (Fig. 86) is completely formed that those disap- 
pear. At that epoch the extremities of the old matrix, then sunken 
almost to the base of the stump, are joined, and the orifice between the 
cavities below and above the cupola is closed. Shortly thereafter the 
process of the disappearance of the old tissues ends. 
