APPENDIX. 343 



The entire list may be understood to include only such 

 objectives as we have used to a greater or less extent 

 in practical work, and of which we can therefore speak 

 from experience, and without prejudice to other reliable 

 makers. 



We earnestly advise the student contemplating the 

 purchase of object glasses, especially when ordering 

 the same to be made by the optician, to seek the advice 

 of some expert friend. Protection is thus afforded both 

 to the maker and the buyer, and it has often happened 

 that the latter, through sheer incompetency, returns a 

 really fine glass to its maker, with the assertion that it 

 has proved unsatisfactory. While on the other hand, 

 especially in glasses of high balsam angles, there IS a 

 choice in the work of the very best makers. The ex- 

 pert, too, will render valuable assistance in specifying 

 the exact kind of objective desired. 



MICROSCOPE STANDS, BY W. H. BULLOCH, NO. 126 

 CLARK STREET, CHICAGO, ILL. 



Large best stand, Al, binocular, iris diaphragn, with the 



latest improvements, draw-tube, 5 eye pieces $300 00 



Same as above, but monocular, iris diaphragm, with three 



eye pieces 250 00 



Polished mahogany case, with side case for accessories. 25 00 

 Small best stand, A. B., binocular, 4 eye pieces and iris 



diaphragm 225 00 



Monocular, two eye pieces and iris diaphragm 175 00 



Polished mahogony case 20 00 



44 D " stand, all brass, 2 eye pieces and case 75 00 



41 D " stand, ail brass except the base, 2 eye pieces and 



case.., 67 00 



