Lastly, a very remarkable and unexpected corroboration of this part of my doctrine has to be mentioned, which has recently been communicated from ancient Hindoo philosophy by Colebrook. In his exposition of the philosophical schools of the Hindoos,[207] he quotes the following as the doctrine of the Nyaga school: "Volition, Yatna, effort or manifestation of the Will, is a self-determination to act which gives satisfaction. Desire is its occasion, perception its motive. Two kinds of perceptible effort of the will are distinguished: that which springs from desire which seeks the agreeable, and that which springs from aversion which shuns the repulsive. Another species, which escapes sensation and perception, but is inferred from analogy of spontaneous acts, comprises animal functions, having for a cause the vital, unseen power." Here the words "animal functions" are evidently used, not in a physiological, but in a popular sense: so that here organic life is unquestionably derived from the will. We find a similar statement in Colebrook's Report on the Vedas[208] where he says: "_Asu is unconscious volition_, which occasions an act necessary to the support of life, as breathing, &c." [207] "Transactions of the Asiatic Society of Great Britain," 1824, p. 110. [208] "Asiatic Researches," vol. 8, p. 426. Moreover my reduction of vital energy to the will by no means interferes with the old division of its functions into reproductive force, irritability and sensibility. This division remains a deep view of their difference, and gives occasion for interesting observations.