1910.] The Chromajyhil Tissues and the Adrenal Medulla. 509 



Text-fig. 10. — Abdominal Chromaphil Bodies 

 of a Rabbit. Lettering as in previous 

 figures. The principal body is paired, as 

 also is a continuation towards the adrenal 

 on one side. 



Text-fio. 11. — Abdominal Chroma- 

 phil Bodies of a Rabbit. Letter- 

 ing as in previous figures. The 

 principal body is bifurcated ante- 

 riorly and posteriorly. 



is shown in one of Kohn's drawings, and corresponds with what I found some 

 years ago in the young rabbit. I described the appearance as follows: — 

 "" In young animals one sometimes finds that the medulla has not yet 

 become completely surrounded by cortex, but comes to the surface at some 

 point. In the case of the suprarenal capsule of a young rabbit, I noted a very 

 interesting appearance. Near that part of the circumference where the 

 medulla reached the surface was a sympathetic ganglion outside the capsule 

 of the organ. Near to it, also outside the capsule, was a mass of cells 

 resembling those of the suprarenal medulla, only not so uniformly stained by 

 the bichromate."* This was clearly a group of chromaphil cells, and if serial 

 sections had been cut, doubtless a direct continuity between it and the 

 medulla would have been seen. 



In the other animals examined, viz., monkey, pig, guinea-pig, rat, gopher 

 and squirrel, no chromaphil bodies have been recognised with certainty. 

 This is especially interesting in the case of the rat. Schaferf recently 

 exhibited a white rat which was operated upon by Harley some time 

 between 1856 and 1858. This rat had the spleen and adrenals extirpated 

 vhen it was only a mouth old and quite small. It increased in size after 



* ' Internat. Monatsschr. f. Anat. u. Physiol.,' 1898, Bd. 15, Heft 10 u. 11. 

 + Oliver-Sharpey Lectures, ' Brit. Med. Journ.,' May 30, 1908. 



