Published Sources for
the above Quotations: |
F: |
In "Life and Letters of Spencer," ch. 20, by Duncan. |
R: |
In "The Speaker's Electronic Reference Collection," AApex Software, 1994. |
A: |
In "Isaac Asimov's Book of Science and Nature Quotations," ed. Jason Shulman & Isaac Asimov, 1988. |
N: |
In "Isaac Asimov's Book of Science and Nature Quotations," ed. Jason Shulman & Isaac Asimov, 1988. |
K: |
"Principles of Biology," pt 3, ch. 12, 1864-1867. |
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