242 HOW TO SEE WITH THE MICROSCOPE. 



some corresponding good." And fortunate it is, in the 

 case before us, there is a fascination accompanying the 

 intelligent use of the microscope knowing neither limit 

 nor bounds, and the task of becoming well acquainted 

 with the use of the instrument is merely a labor of love. 

 There is another aspect of the matter which deserves a 

 word or two, to wit: The popular idea with many is, 

 that if there be a certain amount of eye training essen- 

 tial in the use of the " high powers," this has no appli- 

 cation to those who use the lower amplifications. Says 

 one, " you are all right about your ey^ education when 

 there is such nice work as showing the 19th band in 

 hand ; but then you see most of my work is done with 

 the inch, and that's quite another thing." Now there 

 is just as much error here, but it is of a less serious 

 character. The truth is, the expert can see more with 

 the inch, and by the "expert" I mean (for the time 

 being) those referred to who are able to display hand- 

 somely such tests as the 19th band. Every day expe- 

 rience with pupils in the laboratory demonstrate this 

 fact pointedly. Thus: At the commencement of his 

 practice, the novice is quite content with the meanest 

 French triplet the premises afford, but in less than a 

 month he will hold it in perfect contempt, and his sub- 

 sequent progress will to a great extent be properly 

 measured or indexed by the constantly increasing capa- 

 city to handle even these non-adjusting glasses. 



In thus insisting on the necessity of the proper edu- 

 cation of the eye, let us look for a moment to its im- 

 portant bearing on a particular class of observations. 



