Red Giants and White Dwarfs : Man's Descent from the Stars (1971), p. 249.
“[Why do animals] undergo in the course of their growth a series of complicated changes, during which they acquire organs which have no function, and which, after remaining visible for a short time, disappear without leaving a trace... The explanation of such facts is obvious. The stage when the tadpole breathes by gills is a repetition of the stage when the ancestors of the frog had not advanced in the scale of development beyond a fish.”
Comparative Embryology, p. 702. (1880)
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Francis Maitland Balfour 1
British biologist 1851–1882Related quotes

God doesn't believe in atheists (2002)

Source: Memoirs of a Superfluous Man (1943), p. 39
Context: Reading implies a use of the reflective faculty, and very few have that faculty developed much beyond the anthropoid stage, let alone possessing it at a stage of development which makes reading practicable.
As I said, the fact that few literate persons can read is easily determinable by experiment. What first put me on track of it was a remark by one of my old professors. He said that there were people so incompetent, so given to reading with their eyes and their emotions instead of with their brains, that they would accuse the Psalmist of atheism because he had written, "The fool hath said in his heart, There is no God." The remark stuck by me, and I remember wondering at the time whether the trouble might be that such people hardly had the brains to read with. It seemed possible.
Source: Break-Out from the Crystal Palace (1974), p. 168

(1847)

“I never had a stage mother, which is probably one of the reasons why I’m still doing this.”
Interview by Nicki Gostin, Newsweek, Updated: 10:46 a.m. ET March 11, 2005
“When you were a tadpole and I was a fish
In the Paleozoic time”
Evolution (1895; 1909)
Context: When you were a tadpole and I was a fish
In the Paleozoic time,
And side by side on the ebbing tide
We sprawled through the ooze and slime,
Or skittered with many a caudal flip
Through the depths of the Cambrian fen,
My heart was rife with the joy of life,
For I loved you even then.

"The Singularity," The New Humanists: Science at the Edge (2003)