[26] Wolff, "Beitraege zur Kritik der Darwin'schen Lehre," _Biolog. Centralblatt_, Vol. X., Sept. 15, 1890, and "Bemerkungen zum Darwinismus mit einem experimentellen Beitrag zur Physiologie der Entwicklung," _Biolog. Centralblatt_, Vol. XIV., Sept. 1, 1894. [27] Henry B. Orr, _A Theory of Development and Heredity_, New York, 1893. [28] Yves Delage, _La structure du protoplasma et les theories sur l'heredite et les grands problemes de la biologie generale_, Paris, 1895. [29] Henslow, _The Origin of Species Without the Aid of Natural Selection, A Reply to Wallace_. 1894. [30] If any one should deem these words too severe, let him read the sarcastic passages in which Eimer has dispatched the late unfortunate Eric Haase who had been presumptuous enough to oppose the Tuebingen Professor's deliverances on certain points. Haase, as we all know, fell a victim to the climate of the tropics, shortly after resigning the post of Director of the natural science collections in Bangkok, in order to return to Germany and to work out the fruits of his tropical sojourn. The unfortunate end of this accomplished man who had rendered important services to science had no effect in mollifying the resentment of Herr Eimer at the opposition which his views had encountered; and in twenty printed pages he takes him to task in the most personal and rancorous manner for this affront, remarking at the close: "In the meantime Herr Haase has died. Nevertheless I owe it to myself, in spite of this occurrence, to make public the foregoing facts, in order," etc. Any one who is interested in knowing the motives of Herr Eimer's excuse may find them in his book _Artbildung and Verwandtschaft bei den Schmetterlingen_, Part II., p. 66. [31] "Gedanken zur Descendenz- und Vererbungstheorie." _Biolog. Centralblatt_, July 15, 1893. [32] C. Lloyd Morgan, _Animal Life and Intelligence_, London, 1890-1891, p. 30-33. [33] _Materials for the Study of Variation with Especial Regard to Discontinuity in the Origin of Species_, London, 1895, p. 16. [34] "Gedanken zur Descendenz- and Vererbungstheorie," _Biolog. Centralblatt_, 1893, Vol. XIII., p. 397.