Of course it may be argued that these facts have not really the significance which they seem to me to possess. It may be said that when Divine power created insects, they were created with these remarkable developmental processes. By such arguments the conclusions of geologists were long disputed. When God made the rocks, it was tersely said, He made the fossils in them. No one, I suppose, would now be found to maintain such a theory; and I believe the time will come when it will be generally admitted that the structure of the embryo, and its developmental changes, indicate as truly the course of organic development in ancient times as the contents of rocks and their sequence teach us the past history of the earth itself. FOOTNOTES: [1] Darwin’s “Researches into the Geology and Natural History of the Countries visited by H.M.S. _Beagle_,” p. 326. [2] Introduction to Entomology, vi. p. 50. [3] Manual of Entomology, p. 30. [4] Linnean Journal, vol. xi. [5] Introduction to the Modern Classification of Insects, p. 17. [6] Linnean Transactions, 1863—“On the Development of _Chloëon_.” [7] The figures on the first four plates are principally borrowed from Mr. Westwood’s excellent “Introduction to the Modern Classification of Insects.” [8] “Sur la Domestication des _Clavigers_ par les Fourmis.” Bull. de la Soc. d’Anthropologie de Paris, 1868, p. 315. [9] Westwood’s Introduction, vol. i. p. 36. [10] Westwood’s Introduction, vol. ii. p. 52. [11] Die Fortpflanzung und Entwickelung der Pupiparen. Von Dr. R. Leuckart. Halle. 1848. [12] Ann. des Sci. Nat., sér. 4, tome vii. See also _Natural History Review_, April 1862. [13] Ann. and Mag. of Nat. Hist. 1852. [14] Zeits. für Wiss. Zool. 1869. [15] Transactions of the Linnean Society, 1863. [16] Lectures on the Anatomy, &c. of the Invertebrate Animals. [17] Untersuchungen über die Entwickelung und den Bau der Gliederthiere, 1854. [18] Linnean Transactions, vol. xxii. 1858. [19] “Embryological Studies on Hexapodous Insects.” Peabody Academy of Science. Third Memoir. [20] Mém. de l’Acad. Imp. des Sci. de St. Pétersbourg. 1869. [21] Observationes de Prima Insectorum Genesi, p. 14. [22] Mém. de l’Acad. Imp. des Sci. de St. Pétersbourg. tome xvi. 1871, p. 35. [23] Recherches sur l’Evolution des Araignées. [24] Philosophical Transactions, 1841. [25] Monog. of the Gymnoblastic or Tubularian Hydroids. See also Hincks, British Hydroid Zoophytes. Pl. x. [26] Loc. cit. p. 315. [27] Philosophical Transactions, 1859, p. 589. [28] “Facts for Darwin,” Eng. Trans. p. 127. [29] Rolleston, “Forms of Animal Life,” p. 146. [30] A. Agassiz, “Embryology of the Starfish,” p. 25; “Embryology of Echinoderms.” Mem. of Am. Ac. of Arts and Sciences N.S. vol. ix. p. 9. [31] Ueber die Gattungen der Seeigellarven. Siebente Abhandlung. Kön. Akad. d. Wiss. zu Berlin. Von Joh. Müller, 1855, Pl. iii. fig. 3. [32] Huxley, Introduction to the Classification of Animals, p. 45.