298 
GEORGE ARNOLD. 
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EXPLANATION OF PLATE 25, 
Illustrating Mr. George Arnold’s paper “On the Condition 
of the Epidermal Fibrils in Epithelioma.” 
[The outlines of all the drawings, except figs. a1 and 7, were drawn 
with a Zeiss Zeichenapparat, at the level of the stage. 2 mm. 1*40 N. A. 
immersion objective Zeiss, and compensating oculars 2 and 8 were used. 
All the figures are drawn from a preparation of an epithelioma of 
the tongue. The preparations were stained with Heidenhain’s iron-alum 
hematoxylin and orange G. sectioned 5 p thick.] 
Fig. 1. — Five prickle-cells of an epithelioma, of which cells a, b, and c, 
contain unaltered fibrils. In cell d the fibrils are in an early stage of 
degeneration. Cell b shows amitotic division of the nucleus. The 
junction of cells a and b and b and c present the normal surface 
outline of the cytoplasm. At p typical prickles are seen, due to insuffi- 
cient fixation. 8 oc. and 2 mm. immersion. 
