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Updated: May 19, 2025
Suppose that it has taken five hundred years to form the greyhound out of his wolf-like ancestor. This is a mere guess, but it gives the order of the magnitude." Now, if so, "how long would it take to obtain an elephant from a protozoon, or even from a tadpole-like fish? Ought it not to take much more than a million times as long?" Mr.
The vigorous motility of the tadpole-like organisms is obvious to anyone who has ever seen fresh semen under the microscope; and if it is correct, as Clifton Edgar states, that the spermatozoa may retain their full activity in the female organs for at least seventeen days, they have ample time to exert their energies.
Mr. Mivart then quotes from Mr. Murphy whose work I have not seen the following passage: Suppose that it has taken five hundred years to form the greyhound out of his wolf-like ancestor. This is a mere guess, but it gives the order of magnitude. Now, if so, how long would it take to obtain an elephant from a protozoon or even from a tadpole-like fish?
They were not walking, they were indeed limbless, and they had the appearance of human heads, beneath which a tadpole-like body swung. He was too astonished at their strangeness, too full, indeed, of strangeness, to be seriously alarmed by them. They drove towards him, in front of the chill wind that was blowing uphill, much as soap-bubbles drive before a draught.
I should be very sorry to pronounce any opinion upon the foregoing data; but a general impression is left upon my mind, that if the differences between an elephant and a tadpole-like fish have arisen from the accumulation of small variations that have had no direction given them by intelligence and sense of needs, then no time conceivable by man would suffice for their development.
One of them, with a big head, tadpole-like tail and generally frayed and sea-tattered appearance, is, in fact, accepted in some quarters as a ray, while the shovel-like skate is commonly regarded as a shark.
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