THE COMPOUND MICROSCOPE 



23 



have called attention to them, first, because they 

 are inexpensive, and, secondly, because I have 

 handled them and can speak of them with confi- 



FiG. 9. — Watson's " Fkam " Mioeoscope. 



dence. The intending purchaser should, however, 

 consult the catalogues of various makers before 

 selecting an instrument. He will soon discover 



