188 



Mr. Callender on the Thyroid Body, 



[1867. 



fig. 11. In the adult, the pyramid is less often met with than in the foetus* 

 I found it in some form or other, in ten out of forty-two adult male sub- 

 jects, in the foetus four times in eight. Thus it is probable that these out- 

 growths from the foetal thyroid often shrink and disappear with advancing 

 years. 



7-8 9 10 11 



Explanation of Figures. 



Fig. 1. Thyroid from human foetus (eight-tenths of an inch long), about three times 

 the natural size. 



Fig. 2. Thyroid from human foetus (two inches and eight-tenths long), natural size. 

 Fig. 3. Thyroid from foetal rabbit (eight-tenths of an inch long), about three times 

 the natural size. 



Fig. 4. Thyroid from foetal pig (one inch and two-tenths long), about three times 

 the natural size. 



Fig. 5. Thyroid from foetal hare (six inches long), natural size. 



Fig. 6. Thyroid body from human foetus (three inches and nine-tenths long). 



Fig. 7. The same (four inches and three-tenths long). 



Fig. 8. The same (four inches and six-tenths long). 



Fig. 9. The same (six inches and four-tenths long). 



Fig. 10. The same (eight inches and seven-tenths long). 



Fig 11. The same (twelve inches long). 



Figs. 6-11 are drawn, by measurement, the exact natural size. 



