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Updated: May 17, 2025
From Riga I departed, in company with M. Oettinger, lieutenant-colonel of engineers, and Lieutenant Weismann, for Moscow. This is the same Weismann who rendered so many important services to Russia, during the last war with the Turks. On my arrival, after delivering in my letters of recommendation, I was particularly well received by Count Bestuchef.
Ten years ago Lamarck's name was mentioned only as a byword for extravagance; now, we cannot take up a number of Nature without seeing how hot the contention is between his followers and those of Weismann. This must be referred, as I implied earlier, to growing perception that Mr. Darwin should either have gone farther towards Lamarckism or not so far.
Since his death, moreover, his disciples have tended to split into two schools. On the one hand, Weismann has rejected the Lamarckian factors, the effect of use and disuse upon organs, and the transmissibility of acquired characters. The importance of these factors has been emphatically re-asserted, on the other hand, by Lankester and others.
It is precisely the same as Haeckel’s, although he is opposed to Haeckel in regard to the strictly Darwinian standpoint. The Theory of Descent has conquered, and it may be said with assurance, for ever. That is the firm conviction on which the whole work is based, and it is really rather treated as a self-evident axiom than as a statement to be proved. Weismann takes little trouble to prove it.
With respect to the direct action, we must bear in mind that in every case, as Professor Weismann has lately insisted, and as I have incidently shown in my work on "Variation under Domestication," there are two factors: namely, the nature of the organism and the nature of the conditions.
All that is today sound biology and psychology; and the efforts of Natural Selectionists like Weismann to reduce evolution to mere automatism have not touched the doctrine of Jesus, though they have made short work of the theologians who conceived God as a magnate keeping men and angels as Lord Rothschild keeps buffaloes and emus at Tring.
It is clear that the factors that direct the development of a wood frog's egg so that it becomes a wood-frog and not a tree-toad must lie in the egg itself, as derivatives from the two parent organisms. Weismann and his followers have proved that a peculiar substance in the nuclei of the egg and its daughter-products contains the essential factors of development, whatever these may be.
Wallace, who does not appear to have read Professor Weismann's essays themselves, but whose remarks are, no doubt, ultimately derived from the sequel to the passage just quoted from page 266 of Professor Weismann's book, contends that the impossibility of the transmission of acquired characters follows as a logical result from Professor Weismann's theory, inasmuch as the molecular structure of the germ-plasm that will go to form any succeeding generation is already predetermined within the still unformed embryo of its predecessor; "and Weismann," continues Mr.
Exactly as Weismann predicted the striping of the hawk-moth caterpillars and the human os centrale, Goethe predicted the formation of the skull from modified vertebræ, and the premaxillary bone in man. In precisely the same way he “derived” the cavities in the human skull from those of the animal skull.
At home was several hours' hack-work waiting for him before he went to bed, and after he went to bed there was a volume of Weismann waiting for him, to say nothing of Herbert Spencer's Autobiography, which was as replete for him with romance as any thrilling novel. Why should he waste any time with this man he did not like? was his thought.
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