FIG. 60. 



FIG. 61. 



FIG. 62. 



FIG. 63. 



FIG. 64. FIG. 65. 



FIGS. 60-65. Semi-diagrammatic sketches showing the position of the 

 parathyroids, the thyroid, and the trachea in the dog. The para- 

 thyroids in dotted lines are " internal." 



265 



