^.09 



02 



APPENDICES. 



several layers of connective tissue, li;ied by a tender membrane, 

 which is colored by the secretion, and exhibits minute follicular 

 apertures. The castoreum is light or dark yellow in different 

 cases, viscid, adhesive, gritty from the presence of calcareous mat- 

 ter, and has a strong, peculiar odor. Under the microscope, it 

 shows granular and epithelial matter, and spherical crystals of 



Fig. 2. 



Drawn by W. W. Ely. 

 Note to Figurks 2 and 3. 



carbonate of lime; these crystals are also found in the urine of the 

 beaver. In the male, the castoreum sacs measured 4^" in length, 

 2" W" in width, with a circumference of 4|". Weight of one 

 sac and contents, 900 grains. From both sacs 415 grains of pure 

 castoreum was obtained, but the whole of the secretion could not 

 be removed. 



The oil sacs, or "preputial glands" (Cuvier), are connected 



