SEA-FISHEKIES LABORATORY. 



293 



centres of growth, and these have run together. Cutting down 

 into them we find a genera] softening, or necrosis, and this 

 has gone so far as to lead to a breaking through the surface 

 at the top of the foremost growth. There is a peripheral zone 

 of firm tissue, but internal to this the tumour is semi-liquid 

 in consistency. 



The histology is represented, under a magnification of about 

 10 diameters, in Fig. 2. The figure represents a section taken 



Malignant t/ssu e 



(Degenerating Sea. les 

 luSc/e fibres* \ / \ 



777 u 



- 



; '■'■■-' : 



mm^-W^ 



V-;' 'l't- 



Fig. 2. 



at the margin of the tumour, that is, at the growing part. 

 The skin is shown diagrammatically, with several scales in 

 position, each in its epithelial pocket. Below these is the 

 dermis, here a rather thick, fibrous layer. To the right of the 

 part represented in the figure this dermal layer thins out and the 

 scales disappear, though the ordinary pigmentation of the skin 



