330 J. D. Whelpley on Philosophical Analogy. 
only the habits of an animal, but the physiological conditions of 
those habits—not only the changes of a metal, but the chemical 
conditions of those changes. We wish to have an idea of the 
animal life, and of the substances of nas 
To limit these remarks more accurately,—let us premise, that 
our sensuous knowledge of inorganic nature is acquired through 
our departments of observation ; to wit, 
1. Of the masses of matter, in all their conditions, whether of 
solid, liquid or aériform, amorphous or crystalline, dense or rare. 
This includes all that can be ‘said of inorganic substances con- 
sidered as permanently existing, under the conditions in which 
they are observed. 
2. Of changes happening in all forms, and masses, of unorgan- 
ized matter. This regards changes of temperature, and all me- 
chanical changes, elastic, of expansion, contraction, &c., referred 
always to sony ti as it lies in mass, with no reference to ‘its inter- 
, or atom 
3. Of sti eanenal condition of matter, or rather of those prop- 
erties which give rise to a theory of its internal condition. 
These include all observations with reagents, in the laboratory. 
emistry. 
4. Of the internal motions of matter, electric, gravitant, mag- 
— P came and thermogenic, (light-producing and heat- 
These give rise to theories of decomposition and 
fected oslticas and of atomic motions in general :—dynam amicat 
and statical chemistry. 
and on should find the field ‘prepared for them: ‘The ~_ 
losopher who never passes the limits of truth and necessity, 18 
well content that his predecessor should have prepared the way 
for him. He regards his predecessors with the same respect that 
he claims from his successo 
In the present condition of our nomenclature, it is very difficult 
The 
to classify the departments of science correctly. great de- 
ments are each of them vast collections of facts, 1 which 
every kind of observation has been brought to And 
whole: put poseisat: soienee; being to form a true and perfect idea 
