"Inest sua gratia parvis." "Les petites choses n'ont de valeur que de la part de ceux qui peuvent s'elever aux grandes."-De Jouy. There is no department of inquiry in which it is not full as easy to miss truth as to find it, even when the materials from which truth is to be drawn are actually present to our senses. A child does not catch a gold fish in water at the first trial, however good his eyes may be, and however clear the water; knowledge and method are necessary to enable him to take what is actually before his eyes and under his hand."