[65] At p. 485 Wallace deals with Fleeming Jenkin's review in the _North British Review_, 1867. The review strives to show that there are strict limitations to variation, since the most rigorous and long-continued selection does not indefinitely increase such a quality as the fleetness of a racehorse. On this Wallace remarks that the argument "fails to meet the real question," which is not whether indefinite change is possible, but "whether such differences as do occur in nature could have been produced by the accumulation of variations by selection." [66] Abstract of a paper on "Birds' Nests and Plumage," read before the British Association. See _Gard. Chron._, 1867, p. 1047. [67] Sir Henry Holland, Bart., M.D., F.R.S., a writer on Mental Physiology and other scientific subjects (b. 1788, d. 1873). [68] "This turns out to be inaccurate, or greatly exaggerated. There are no true alpines, and the European genera are comparatively few. _See_ my 'Island Life,' p. 323."--A.R.W. [69] "In pigeons" and "lizards" inserted by A.R.W. [70] See _Westminster Review_, July, 1867, p. 37. [71] _Proc. Linn. Soc._, 1867-8, p. 57. [72] It is not enough that females should be produced from the males with red feathers, which should be destitute of red feathers; but these females must have a _latent tendency_ to produce such feathers, otherwise they would cause deterioration in the red head-feathers of their male offspring. Such latent tendency would be shown by their producing the red feathers when old or diseased in their ovaria. [73] The symbols [male symbol], [female symbol] stand for male and female respectively. [74] The fifth. [75] Explained in letter of February 2, 1869. _See_ p. 234. [76] June, 1867. [77] "Malay Archipelago." [78] "Malay Archipelago." [79] The fifth edition, pp. 150-7. [80] In the _Quarterly Review_, April, 1869. [81] Inserted by A.R.W. [82] "The Descent of Man." [83] "The Genesis of Species," by St. G. Mivart. 1871. [84] In the _Academy_, March 15, 1871. [85] "Mr. Wallace says that the pairing of butterflies is probably determined by the fact that one male is stronger-winged or more pertinacious than the rest, rather than by the choice of the females. He quotes the case of caterpillars which are brightly coloured and yet sexless. Mr. Wallace also makes the good criticism that 'The Descent of Man' consists of two books mixed together."--"Life and Letters of Charles Darwin," iii. 137. [86] G. Crotch was a well-known coleopterist and official in the University Library at Cambridge.