Page 73 - My FlipBook
P. 73
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Inaugural Dissertation. S3
fed with the madder, are dyed red ; and~ this color remains
permanent."
Mr. Hunter's experiments with madder indeed, seem a
powerful argument in favor of his doctrine, nor have they yet
been disproved, though it would appear so from the following
extracts :
" Mr. Hunter having observed that the teeth of animals fed
with madder, did not become tinged so speedily as other
bones; or, when tinged, that they retained their color longer,
hence concluded, that they are to be considered as inorganiz-
ed bodies, with respect to a circulation through their sub-
stance." Fox. Part II, -page 1.
" An incontestable proof of the presence of vessels, both
circulatory and absorbent, and consequently of nerves, maybe
deduced from the progressive growth of the inzisores in the
squirrel tribe, and the coloring of the teeth of all animals, from
feeding on food mixed with madder, and the subsequent loss of
the acquired color from discontinuing the use of the madder."
— Blake's Essay on the Teeth of Man. Page 122.
This was merely an inference by Dr. Blake, and was pro^
bably deduced from his own experiments with madder, which
must have satisfied him that Mr. Hunter's experiments were
incorrect ; for he says in his work on the teeth, that he wa3
engaged at that time, in the experimental investigation of the
subject, and that he intended to make public the result ; but I
cannot find that he ever put his intentions into execution.
Mr. Hunter's experiments lose much of their force, since
he does not inform us how long he continued them ; for it
may require a longer lime to effect these changes, viz. the
coloring of the teeth of old animals,- and the removal of the
coloring by absorption from the teeth of young ones, fed with
madder, than he allowed, on account of the great density of
their structure.
The following are the results of my own experiments on
rabbits, fed with madder:
Inaugural Dissertation. S3
fed with the madder, are dyed red ; and~ this color remains
permanent."
Mr. Hunter's experiments with madder indeed, seem a
powerful argument in favor of his doctrine, nor have they yet
been disproved, though it would appear so from the following
extracts :
" Mr. Hunter having observed that the teeth of animals fed
with madder, did not become tinged so speedily as other
bones; or, when tinged, that they retained their color longer,
hence concluded, that they are to be considered as inorganiz-
ed bodies, with respect to a circulation through their sub-
stance." Fox. Part II, -page 1.
" An incontestable proof of the presence of vessels, both
circulatory and absorbent, and consequently of nerves, maybe
deduced from the progressive growth of the inzisores in the
squirrel tribe, and the coloring of the teeth of all animals, from
feeding on food mixed with madder, and the subsequent loss of
the acquired color from discontinuing the use of the madder."
— Blake's Essay on the Teeth of Man. Page 122.
This was merely an inference by Dr. Blake, and was pro^
bably deduced from his own experiments with madder, which
must have satisfied him that Mr. Hunter's experiments were
incorrect ; for he says in his work on the teeth, that he wa3
engaged at that time, in the experimental investigation of the
subject, and that he intended to make public the result ; but I
cannot find that he ever put his intentions into execution.
Mr. Hunter's experiments lose much of their force, since
he does not inform us how long he continued them ; for it
may require a longer lime to effect these changes, viz. the
coloring of the teeth of old animals,- and the removal of the
coloring by absorption from the teeth of young ones, fed with
madder, than he allowed, on account of the great density of
their structure.
The following are the results of my own experiments on
rabbits, fed with madder:
