34 



SELECTION AND 



DIFFERENT FORMS OF THE COMPOUND MICRO- 

 SCOPE. 



The variety of styles or patterns which have been devised for 

 the stands and for the general arrangement of compound micro- 

 scopes, is almost infinite, and as they are continually changing, 

 it would be a hopeless task to attempt to give such a descrip- 

 tion as would be of real value to the reader, and since, from 

 motives of self-interest, the manufacturers of these instruments 

 promptly publish full descriptions and engravings of new styles 

 as soon as they bring them out, the best plan for those who 

 desire to make a judicious selection is to procure the catalogues 

 of as many manufacturers as possible, and carefully compare 

 the several advantages of the different forms. To facilitate 

 this, we give, at the end of the volume, the 

 addresses of most of the prominent makers. 



There are, however, a few typical styles or 

 models to which it may be well to call at- 

 tention, and of these we give engravings 

 and such descriptions as will enable the 

 reader to form some idea of the stand best 

 suited to his special wants. In selecting 

 illustrations of the different types, we have 

 taken the cheaper forms in preference to the 

 more perfect, but more expensive models. 



French Vertical Microscopes. 



This form, although modern when com- 

 pared with the microscopes of Adams, 

 Baker, etc., is one of the oldest forms in 

 use. It was, we believe, devised by Wol- 

 laston, as a stand for his doublet, and it 

 is now too well known to need elaborate 

 description, and as no microscopes of any 

 value are ever constructed upon this plan, 

 it is unnecessary to point out its defects. 

 The smaller sizes are still sold extensively; 

 and being manufactured in large quanti- VERTICAL MICROSCOPE. 



