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Secondly, with regard to teratology, it is notorious that similar abnormalities are often found to co-exist in both the pelvic and thoracic limbs. M. Isidore Geoffroy St. Hilaire remarks, "L'anomalie se répète d'un membre thoracique au membre abdominal du même côté."
Herbert Spencer's explanations. An internal power necessary, as shown by facts of comparative anatomy. Of teratology. M. St. Hilaire. Professor Burt Wilder. Foot-wings. Facts of pathology. Mr. Dr. William Budd. The existence of such an internal power of individual development diminishes the improbability of an analogous law of specific origination.
In compiling the literature of this subject it is very interesting to observe the two contrasting views respecting the nature of this anomaly. Some writers, and among them Masters in his "Vegetable Teratology" consider the deviations to be merely accidental. According to them some species are more subject to this anomaly than others, and the houseleek is said to be very prone to this change.
Pare describes and pictures a monster, at Rome, on November 3, 1520, with the upper portion of a child apparently about five or six years old, and the lower part and ears of a fish-like animal. He also pictures a sea-devil in the same chapter, together with other gruesome examples of the power of imagination. Early Teratology.
There is a recognized branch of science familiar to all those who know anything of the studies relating to life, under the name of Teratology. It deals with all sorts of monstrosities which are to be met with in living beings, and more especially in animals.
Penzig in his valuable work on teratology gives a list of 33 such genera, many of them repeating the anomaly in more than one species. Ordinary cabbages are perhaps the best known instance, and any unusual abundance of nourishment, or anomalous cause of growth seems to be liable to incite the development of bracts.
For the study of Moral Teratology will teach you that you do not get such a malformed character as that without a long chain of causes to account for it; and if you only knew those causes, you would know perfectly well what to expect.
It remains now to consider what are the evidences in support of the existence of an internal power, by the action of which these homological manifestations are evolved. It is here contended that there is good evidence of the existence of some such special internal power, and that not only from facts of comparative anatomy, but also from those of teratology and pathology.
About the first half of the eighteenth century what might be called the positive period of teratology begins. Following the advent of this era come Mery, Duverney, Winslow, Lemery, and Littre. In their works true and concise descriptions are given and violent attacks are made against the ancient beliefs and prejudices.
"Moral Teratology," for instance, which is marked No. 67 on my list of "Essays Potential, not Actual," suggests sufficiently well what I should be like to say in the pages it would preface. People hold up their hands at a moral monster as if there was no reason for his existence but his own choice.
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