COSMIC PHILOSOPHY 



aggregate as the human organism can we assert 

 the absence of interfering conditions which, after 

 a certain point, will entirely change the order of 

 the two variations. In point of fact there are 

 such interfering conditions, due partly to the 

 control exercised by the sympathetic nerve over 

 the contraction and dilatation of the cerebral 

 blood-vessels, and partly to other circumstances 

 too complicated to be here mentioned. 



Now it is the business of logic to codify, 

 upon abstract principles, the rules of scientific 

 investigation ; to determine what shall be ad- 

 mitted as trustworthy evidence, and what shall 

 not be so admitted ; to point out the class of 

 problems which each implement of research is 

 best fitted to solve ; and to enumerate the pre- 

 cautions which must be taken in order to use 

 each implement with skill and success. Logic 

 is therefore a science which contributes to all 

 the others, and to which all the others contrib- 

 ute. Though we may, and indeed must, ac- 

 quire familiarity with its methods by direct 

 practice in the study of the various sciences, 

 yet the advantage of understanding the general 

 theory of those methods, as a science by itself, 

 cannot well be questioned after the foregoing 

 explanation. To become familiar with the val- 

 ues of different kinds of evidence, and with the 

 processes by which evidence is procured, a 

 lawyer must practise in court ; yet every lawyer 

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