I. A metrical analysis of chromosome complexes, showing correlation of evolutionary development and chromatin thread-width throughout the animal kingdom

Abstract
The phenomena connected with development of the germ-cells have been studied in many animal types, and each year papers are published upon Spermatogenesis and Oogenesis in new species, thereby adding to the knowledge that we already possess. It is impossible, through lack of space, to enumerate here the work done upon the subject, but reference to any comprehensive bibliography will show that organisms representative of the various phyla of the animal kingdom, and in many cases representative of the classes, orders, families, and genera of these phyla have been carefully studied. Certain species, moreover, have proved themselves particularly suited to cytological investigation, and have accordingly been studied independently by several workers; such examples are seen in the papers of van Beneden, Boveri, Brauer, Edwards, Marcus, and Tretjakoff, upon the Nematode, Ascaris; and in those of Flemming, Janssens, Meves, Montgomery, vom Rath, and the Schreiners, upon the Amphibian, Salamandra. The class that has been most thoroughly studied is the Insecta. The Orthoptera have been dealt with by Baumgartner, Carnoy, Davis, Gérard, McClung, Montgomery, Moore, Nowlin, Otte, Robertson, vom Rath, de Sinety, Sutton, Wilcox, Zweiger, and myself; the Hemiptera have been studied by Henking, Montgomery, Paulmier, Stevens, and Wilson; and the Coleoptera by Auerbach, Debaisieux, Henderson, and Holmgren. Doncaster, Henking, and Mark have written upon Hymenoptera; Grunberg, Meyes, Munson, and Spichardt upon Lepidoptera; and Cholodkovsky and Stevens upon the Diptera. The Orthoptera are particularly good material, and we now possess detailed accounts of development of the sex-cells in Forficulidæ, Blattidæ, Phasmidæ, Acridiidæ, Locustidæ, and Gryllidæ. The study of these numerous types has led to the discovery of many important facts, and to the enunciation of several hypotheses.

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