of the Solvent Glands , &c. ggg 
made up of four small short processes uniting in a middle 
tube, which opens externally by one orifice. 
In the turkey (the Meleagris Gallipavo), the solvent glands 
consist of four small processes, which diverge from one another 
in opposite directions. 
In a species of parrot, (the Psittacus aestivus), the cardiac 
cavity is unusually large and long, and the solvent glands 
are spread over a considerable portion of its surface, the 
gizzard is very small. Its appearance is represented in the 
annexed engraving. 
In many large birds that only walk and run, their wings 
being too small to enable them to fly, the digestive organs are 
formed in many respects differently from those of other birds. 
In the cassowary, (Casuarius Emeu), the solvent glands 
are situated between the crop and gizzard, as in many other 
birds, but this part is dilated into a large cavity, and separated 
from the gizzard by an oblique muscular valve ; in this c vity 
the food may be retained for some time, but cannot be triturated 
there, since the stones and other hard bodies swallowed, will 
readily force a passage into the gizzard. 
I have not had an opportunity of examining the solvent 
glands in the cassowary, and therefore can say nothing re- 
specting their structure from my own observation. 
In the American ostrich, (the Rhea americana), the solvent 
glands are fewer in number than in other birds. They 
only occupy a small portion of a circular form, on the pos- 
terior side of the cardiac cavity ; this however is compensated 
by the complex structure of which they are composed. To 
each gland there is one common orifice ; when the cavity to 
which it leads is laid open, three smaller orifices are exposed, 
3F2 
