490 NOTsa 



latter are finally explicable as the results of the attraction and 

 rejection of homogeneous and heterogeneous particles. 



195 (ii. 397). Eduard van Beneden, " De la Distinction origi- 

 nelle du Testicule et de I'Ovaire." Brussels, 1874. 



196 (ii. 399). On the Original Hermaphrodite Structure of 

 Vertebrates, cf. Waldeyer, " Ovary and Egg " (" Eierstock und 

 Ei," 1872, p. 152) ; also Gegenbaur (*' Grundriss der vergleichen- 

 den Anatomie," 1874, p. 615). On the origin of the eggs from the 

 ovary-epithelium, cf. Pfliiger, " On the Ovaries of Mammals and 

 Man" ("Die Eierstocke der Saugethiere und des Menschen,*' 

 1863). • 



197 (ii. 423). On the special germ-history of the urinary and 

 sexual organs, cf. Kolliker, " History of the Evolution of Man." 

 On the homologies of these organs, see Gegenbaur (" Grundriss 

 der vergleichenden Anatomie," 1874, pp. 610-628). 



198 (ii. 448). Wilhelm Wiindt, "Lectures on the Human and 

 Animal Mind" (" Vorlesungen iiber die Menschen- und Thier- 

 seele." 1863). W. Wundt, "Outlines of Physiological Psy- 

 chology" ("Grundziige der Physiologishen Psychologie," 1874). 



199 (ii. 457). On Active (actual) and Latent (preteritial) 

 forces, cf. Hermann Helmholtz, " Interoperation of Natural 

 Forces " (" Wechselwirkung der Naturkrafte," Part II., 1871). 



200 (ii. 457). "Anthropology as Part of Zoology." — " Generello 

 Morphologie," voL iL p. 4!32. ** History of Creation,*' voL L 7 j 

 vol. ii d47. 



