THE COMPOUND MICROSCOPE. 101 



land, represented in Plate 2, the other somewhat like that of 

 Mr. Eoss, in fig. 45. The first is the largest and most com- 

 plete ; it is supported on three inclined legs, as in Plate 2, 

 but the mode of mounting the compound body is like that in 

 Plate 1, and the fine adjustment is placed on the top of the 

 arm, not on one side as in Plate 2. To this instrument may- 

 be applied all the usual apparatus, moveable stage, achromatic 

 condenser, &c., with which other first-rate microscopes are 

 furnished. The second microscope is smaller than the pre- 

 ceding, and is intended chiefly for students. In form it is 

 very similar to that represented in fig. 45, but the uprights 

 to support the stage, which is of large size, are shorter ; and 

 it is not generally provided with stage movements or fine 

 adjustment. 



Mr. King makes no claim to originality in the form of 

 stands he adopts, but has selected what he deems the best 

 points of construction in those of the first London makers. 

 The author can, however, highly commend the manner in 

 which the work is executed. 



Report speaks well of the stand of the achromatic microscope 

 constructed by Mr. Abrahams, of Liverpool, which very much 

 resembles that of Mr. Ross, in fig. 45. The stage employed 

 in this microscope has either a rack movement or is one after 

 the plan of the author, in which two levers, capable of being 

 removed, are used to give motion in two opposite directions. 

 Mr. Abrahams also supplies a lenticular achromatic prism, as 

 a substitute for the mirror and condenser. 



FOREIGN MICROSCOPES. 



For the Information of such of his readers as may be 

 desirous of knowing what difference of construction exists be- 

 tween English microscopes and those employed on the con- 

 tinent, the author has thought it advisable to describe the 

 forms of stand manufactured by some of the most approved 

 foreign opticians. Amongst these Plossel and Schick, of 

 Vienna ; Pistor, of Berlin ; Chevalier, Oberhauser, and 

 Nachet, of Paris, deserve especial mention. 



