[2] F. Wolf, Modifikationen u. Mutationen von Bakterien, Zts. F. indukt. Abstam. u. Vererbungslehre, II, 1909, p. 90.
[3] Winslow, C. E. A. and A. R.,Systematic Relationships of the Coccaceae. New York. 1909.
[4] C. C. Dobell, Jour. Genetics, 1912, II, p. 201, where full references are given.
Still more recently the same author has contributed an excellent summary of the evidence relating to bacteria (ibid., II. 1913, p. 325).
[5] See Woltereck, Verh. d. Deut. Zool. Ges., 1909, p. 110; and 1911, p. 142. This is a subject which can only be properly appreciated on reference to the original papers. Several complications are involved to which I have not here alluded.
[6] Proc. Roy. Soc., B, Vol. 86, 1913, p. 113.
[7] An Investigation of Evolution in Chrysomelid Beetles of the Genus Leptinotarsa, Carnegie Publications, 1906, No. 48.
[8] This is the famous Colorado beetle or potato-bug, which has caused such serious destruction in potato crops. There seems to be no doubt that this insect, formerly unknown in the eastern States, made its way east along the mining trails when the west was opened up.
[9] This is indicated in the coloured plate, but I have not found any explicit statement to this effect in the text, and am not sure if the absence of pigment was regarded as complete.
[10] Biol. Bull., XVIII, 1910, p. 285.
[11] This description does not quite agree with the representation of the larvae in Pl. 17 of the book Evolution in the Genus Leptinotarsa for there the larva of undecimlineata is shown as white in the second stage, but yellowish in the third stage; perhaps there is an error in printing.