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Difficulties of the theory of descent with modification Absence or rarity of transitional varieties Transitions in habits of life Diversified habits in the same species Species with habits widely different from those of their allies Organs of extreme perfection Modes of transition Cases of difficulty Natura non facit saltum Organs of small importance Organs not in all cases absolutely perfect The law of Unity of Type and of the Conditions of Existence embraced by the theory of Natural Selection.

Might not some central authority be established to grant diplomas to pushing women, which would admit them per saltum to those select circles which they go through so much dirt to reach? The old form of feminine affectation used to be that of a die-away fine lady afflicted with a mysterious malady known by the name of the vapors, or one, no less obscure, called the spleen.

A woman who has made up her mind to die is still afraid of a pistol or a gun. Or is it that the explosion would derange her costume? I say, averages of masses we have, but our tables of maxima we owe to the sporting men more than to the philosophers. The lesson their experience teaches is, that Nature makes no leaps, does nothing per saltum.

The living race is the inheritor of the industry and skill of all past times; and the civilization we enjoy is but the sum of the useful effects of labour during the past centuries. Nihil per saltum. By slow and often painful steps Nature's secrets have been mastered. Not an effort has been made but has had its influence.

Difficulties on the theory of descent with modification Transitions Absence or rarity of transitional varieties Transitions in habits of life Diversified habits in the same species Species with habits widely different from those of their allies Organs of extreme perfection Means of transition Cases of difficulty Natura non facit saltum Organs of small importance Organs not in all cases absolutely perfect The law of Unity of Type and of the Conditions of Existence embraced by the theory of Natural Selection.

On the other hand, the fact that instincts are not always absolutely perfect and are liable to mistakes; that no instinct can be shown to have been produced for the good of other animals, though animals take advantage of the instincts of others; that the canon in natural history, of "Natura non facit saltum," is applicable to instincts as well as to corporeal structure, and is plainly explicable on the foregoing views, but is otherwise inexplicable all tend to corroborate the theory of natural selection.

Indeed we have always thought that Mr. Darwin has unnecessarily hampered himself by adhering so strictly to his favourite "Natura non facit saltum." We greatly suspect that she does make considerable jumps in the way of variation now and then, and that these saltations give rise to some of the gaps which appear to exist in the series of known forms.

For he there sagely observes that wings are not to be added to the human intellect, but rather lead and weights; that all its leaps and flights may be restrained. That this is not yet done, but that when it is we may entertain better hopes respecting the sciences. "Itaque hominum intellectui non plumae addendae, sed plumbum potius, et pondera; ut cohibeant omnem saltum et volatum.

This is not the fact, since, putting illusions and hallucinations out of the question, thoughts and ideas sometimes assume the character and nature of real objects, just as they do in dreams. This fact constitutes the link and gradual assimilation of the two states, since in no series of phenomena natura facit saltum.

In each, the variety appears to have arisen in full force, and, as it were, per saltum; a wide and definite difference appearing, at once, between the Ancon ram and the ordinary sheep; between the six-fingered and six-toed Gratio Kelleia and ordinary men. In neither case is it possible to point out any obvious reason for the appearance of the variety.