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probably fewer still would fail to believe, that similarly shaped 
cells would be wrong, and injurious in man, and the higher 
animals; and what light, I would ask, does either evolution, or 
natural selection throw on such difficult subjects, or on any of 
those secret and inward forces, by which the molecular parts are 
for ever working to produce the whole. 
If the law of nature is, and ever has been, “non per 
saltum ascendere, sed quasi scalis, et gradibus quibusdam,” and 
we can observe for ourselves how very gradual and easy those 
steps are from one animal to another, and how each animal is 
confined by apparent law and choice to its own little circle of 
life, I ask, is it fair to suppose, or likely to be true, that one 
animal has developed out of another beneath it in the scale of 
creation ? 
In conclusion I should like to add, that about two years 
before the death of the late Professor John Morris, of University 
College, I mentioned to him the subject of this short paper; 
and he said to me, I cannot answer your argument, and I believe 
it to be unanswerable. 
