It is important to bear in mind the dictum of the great German pathologist, Professor Virchow: omnis cellula e cellula. All our experiences, whether they have been directed in the search for facts among the elements of the vegetable or among those of the animal kindom, tend to establish this apothegm as a truism.
The questions are often asked: Whence came the first cellule? Was it a development from an atom? What was its previous physical constitution? In reply, it seems but proper to say that the introduction of such inquiries is merely the result of premature consideration. In the discussion of the subject before us we will not say, however, that the examination of some facts touching upon the questions raised is not one of the objects that can come properly within our purview. Reference to the subject of the divisibility of matter may serve to awaken in us
CLARKE AP. DEVELOPMENT OF THE VITAL FORCE. A PHYSIOLOGIC CONSIDERATION OF SOME OF THE FEATURES. JAMA. 1898;XXXI(26):1525–1527. doi:10.1001/jama.1898.92450260029002i
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