240 
DR. MARTIN BARRY ON THE CORPUSCLES OF THE BLOOD. 
a cylinder is formed. In the parietes of this cylinder I have noticed pellucid objects, 
possibly denoting- the continued existence of the orifices above mentioned, as present 
in the nuclei. If such has been the case, it would appear that there exist communi- 
cations between the interior and the exterior of the cylinder (pars. 130, 152, 162.). 
At all events we cannot doubt but that here, as in muscle (par. 161.), the nucleus of 
the original cell is the source from whence the contents of the cylinder immediately 
proceed : and that here, therefore, as elsewhere, we have special centres for the 
origin of new substance. 
179. The main question, however, continues, — are the cells we have been consider- 
ing, derived from corpuscles having the same appearance as corpuscles of the blood ? 
At the surface of the lens, we saw an abundance of young corpuscles forming for 
some special purpose, and corpuscles, having a similar appearance, exhibiting very 
remarkable internal changes. Other changes are represented in fig. 155 ; the objects 
in which figure, found at the edge of the lens, had the same appearance as altered 
corpuscles of the blood. The two in outline (a) exhibited the characteristic red, as 
well as the general appearance of blood-corpuscles, in an unaltered state ; excepting 
only, that in their irregular contour, there were some indications of a future division 
into discs, y was a flattish corpuscle, composed of discs, and still blood-red. The 
objects ci, ei resembled y, but were larger. The nuclei of the cells e, s, q, were quite 
red enough to show their origin to have been in corpuscles having the same appear- 
ance as corpuscles of the blood. All the objects in this figure thus presented red 
colouring matter, — which in a, /3, y, pervaded the entire object, but in £, tj was 
confined to the nucleus of the cell. The more or less incipient cells of fig. 156, were 
obviously altered corpuscles having the same appearance as corpuscles of the blood. 
And the remark just made, respecting colour, applies to the nuclei observed in the 
other cells above referred to as the elements of the crystalline (fig. 154.), as well as 
to the nuclei of those cells which we have seen arranging themselves to form its 
fibres (figs. 157, 158, 159.). 
180. These are the principal observations, which have induced me to believe the 
crystalline lens to be derived from corpuscles of the blood. And, upon the whole, 
I should find it difficult to point out a line, separating the one from what are allowed 
to be the elements of the other. 
181. It maybe added, that among the figures there will be found three outline 
sketches (figs. 138, 139, 140.), representing appearances incidentally observed, in the 
course of my examinations of the Tadpole. The first of these, in a Tadpole of 5'", 
seemed the foundation of the crystalline, as it lay, surrounded by black pigment, and 
imbedded in the vitreous humour. It had the appearance of an altered and prodi- 
giously enlarged corpuscle of the blood ; being throughout red, except at the anterior 
part, a (where it was colourless and pellucid), and being filled with discs, resembling 
those arising in the interior of corpuscles of the blood. At the part marked (3, these 
discs were largest, and of the deepest red. This appearance, together with those 
