PLATE 4 



Photographs of the preparations stained in Held's molybdic acid haematoxylin 



EXPLANATION OF FIGURES 



8 Nerve fibres growing from a group of ten nerve cells. Four-day culture. 

 X14i. 



9 Nerve ending in a fibrin network. Five-day culture. X1320. 



10 An enlarged photograph of one of the nerve ends shown in fig. 8. X540. 



11 An isolated cell lyingover a network of nerve fibres. Cell stains very deeply. 

 Nerve fibres apparently arising from two pales of this cell. Five-day culture. 

 X324. 



