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either near the mouth or the aperture of respiration. 
Some are simple, some complex: as helix pomatia 
and slug compared with sepiz. Some exhibit mus- 
cular thickenings like gizzards, some bony forma- 
tions, as stomachal teeth. These secretions, formed 
in the genus bulla, have been distinguished as the 
shells of an unknown animal. The simple organ- 
ization of acotyledonous and of monocotyledonous 
plants may be analogically contrasted with the more 
complicated vessels of the dicotyledonous vegetables. 
Viscera and vascular system. 
Comparative anatomy in truth presents in all its 
parts such a complete display of analogies, connect- 
ing each with each, demonstrating unity of system 
throughout the whole, and wonderful adaptation of 
contrivance to the most minute diversities of con- 
dition, with unquestionable evidence that the organ- 
ization is independent of the condition to which it 
is adapted, that a general reference to the works of 
Cuvier, Meckel, and Carus, and the authors cited by 
them, might suffice to confirm the leading principle 
which is here proposed to be established; namely, 
an intended manifestation of the unity of design- 
ing power, imposing laws on all conditions of exist- 
ence, itself independent of all, and uncontrolled by 
any. 
In the vascular system, the veins, the heart, and 
the arteries, the same continuity of contrivance ad- 
vancing through different gradations of organization, 
varying widely in appearance, connected closely by 
