ADJUSTABLE OBJECTIVES. 155 



off than I am to-day ; you have made me sick of my ob- 

 jectives." I say, therefore, that it seems to me that this- 

 string must pull, to the end that the microscopist, who 

 desires to invest his money to the best advantage, will 

 be driven to the use of the wide apertures, no matter 

 how strongly he may have become prejudiced in another 

 direction. We believe and earnestly hope, that in pre- 

 senting the subject to the readers of this little work, we 

 have done them a good honest turn, and one that will 

 be appreciated. . 



Before entering on another part of the subject of this 

 book, we desire to add that the views thus set forth are 

 the result of practical expeiience. Here is no specula- 

 tion; but, on the other hand, the reader has before him 

 the fruit of protracted and close study. The time was 

 when we were almost alone in our opinions, but that 

 date is numbered with the past. Among those who* 

 had read his printed articles in their various periodical 

 forms, and have subsequently visited him, " to see for 

 themselves," he can name many of his dearest friends* 

 all of whom have, in turn, placed the writer under 

 countless obligations. And, right here, by the way,, 

 let me say, that, as an interesting and enjoyable pastime, 

 that of " fighting objectives " is, when occasionally in- 

 dulged in, second to no " 2.25" race on record! But 

 of any of the good things of this world " enough is a 

 feast." 



