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ALAN C. SUTTON 



3 



Fig. 2 The growing tip of a nerve, probably sensory, in a 12 mm. pig embryo. 

 (Obj. Leitz, 1/12 oil immersion; ocular 4.) 



Fig. 3 Nerve ends froin a 15 mm. pig embryo. The nerve in the upper right 

 hand corner shows terminal fibrils in union with two myoblasts which are repre- 

 sented only in outline. The other nerve shows an inclusion of two connective 

 tissue cells that are not to be confused with myoblasts. (Obj. Leitz, 1/12 oil 

 immersion; ocular 4.) 



out among the myoblasts, terminating abruptly in bulbous ends, 

 from which several more delicate fibrils extend out into the tissues 

 for a short distance. These fibrils end in similar though smaller 

 bulb-like tips, which have no apparent connection with any cells. 

 This is seen best in the fresh specimens bj" producing currents 

 in the salt solution under the cover-slip by means of a bit of 

 blotting-paper placed at one side and a few extra drops of solu- 



