SECT. 35.] Fallacies. 369 



in the instance in question the letter was lost, not that they 

 were found to be lost in such and such a proportion of cases. 

 Had this latter information been given to us we should really 

 have had but one unknown quantity to determine, viz. the 

 relative frequency with which my correspondent neglects to 

 answer his letters, and we could then have determined this 

 with the greatest ease. 



v. 



