404 Mr. Home on the different Structure and Situations , &c. 
Plate XV. ^ 
An internal view of the cardiac cavity and gizzard of the 
American ostrich, on the same scale as the last plate. 
The orifices of the solvent glands are very conspicuous in 
the cardiac cavity. 
Plate XVI. 
An external view of the cardiac cavity and gizzard of the 
African ostrich, one-sixth of the natural size. 
Plate XVII. 
Represents the internal view of the African ostrich's giz- 
zard, and also a series of solvent glands belonging to different 
birds. 
Fig. 1 . The internal surface of the cardiac cavity and giz- 
zard of the African ostrich. On the same scale as in the last 
plate. 
Fig. 2. A series of solvent glands to show the different 
appearances which they put on. 
