150 POPULAR SCIENCE MONTHLY. 



mechanical manipulations, that they are oblivious to underlying truths 

 shared in common with their own and other subjects, or perhaps fail 

 to appreciate the individual characteristics of a particular subject or 

 group of allied subjects. 



It can not be gainsaid that " a scientific habit of mind can be 

 acquired only by the methodical study of some part at least of what 

 the human race has come scientifically to know." But logic may 

 supplement this indispensable kind of training. In it the methods 

 themselves are made the direct objects of study. Brought together 

 from near and far they may be compared, analyzed and classified with 

 the attention focused upon them in their broad outlines. So pre- 

 sented, with a good body of illustrations, they may be above criticism 

 as too formal or abstract, and furnish both layman and specialist with 

 means of cultivating the sense of discrimination and widening their 

 interests and sympathies. 



