250 DR. MARTIN BARRY ON THE CORPUSCLES OF THE BLOOD. 



Fig. 89. Tadpole, about 5'". Peripheral parts of several epithelium-tables, consist- 

 ing of red discs, which (red discs) enter into the formation of the 

 so-called ramifications of pigment (par. 118.). The central portion of 

 the epithelium-tables here seen, appeared to be dividing into four parts, 

 which, with a pale surrounding substance, are represented in outline 

 only. From the tail. 



Fig. 90. Tadpole, about 5'". A later stage of partitions (pigment ramifications) 

 such as those in fig. 89, together with an object of a deep red colour, 

 and an ovum-like interior. It is a centre for the origin of new epithe- 

 lium-tables. From the tail. 



Fig. 91. Tadpole, about 5^'". Appearance presented by portions of the choroid, 

 arisen in the manner described in par. 118, as that in which the rami- 

 fications of black pigment in the epithelium of the tail have their origin. 

 One of the objects is in outline. The so-called ramifications are really 

 partitions ; but not represented as such in the figure, which is intended 

 ' to show no more than their appearance on a superficial view. 



Fig. 92. Man. Objects from the surface of a furred tongue, a, /3. Outline of 

 epithelium-cells. Their contents, more or less red discs, which were 

 reddest the nearer they were to the nucleus, excepting that in a the 

 very red nucleus was surrounded by a more pellucid space, apparently 

 occupied by larger discs. In (3, the nucleus was very large ; its pellu- 

 cid nucleolus measuring as much as the nucleus of a. The nucleolus 

 of |3 seemed to contain pale discs, y. Outline of a mass of pale blood- 

 red discs. 



Fig. 93. Tadpoles, about 5'". Pigment of the eye, forming out of objects resembling 

 corpuscles of the blood. The part marked ^ is that which had become 

 the blackest, a. Four young blood-corpuscles, observed, along with 

 others of the same kind, in the choroid. They had probably arisen in 

 a manner analogous to that giving origin to the objects at a fig. 94. 

 Three of these young corpuscles are in outline. They were composed 

 of discs ; and in the finished one, a pellucid nucleus was visible on one 

 side. They were blood-red. (B, y. From the same part. (3 For the 

 most part bright red, but approaching black in some parts. A nucleus 

 visible in each, — distinctly in |3, obscurely in y. An orifice on one 

 side in the nucleus of /3. h. An object somewhat resembling ^, The 

 nucleus excepted, it was blood-red. g. Part of an object of the same 

 kind as ^. ^. Partitions between spaces, such as those occupied by h 

 and g ; at first sight appearing black, but, when more closely examined, 

 found to be of a reddish colour. The discs of the bright red h and g 

 undergo division, and are given off, to enter into the formation of the 

 darker and blackish ^. It appears that what is seen of ^ in the figure. 



