ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



515 



ment on a graduated arc with ten divisions, whidi is marked " Vue 

 presbyte," " Vue moyenne," and " Vue myope." 



We believe that the Microscope, though perfect as regards the 

 manner in which it carried out the mechanical part of the problem, 

 was not found in the result to accomplish all that was desired. The 

 very fact of such an attempt being made to restrain the practical 

 jokes of the students ("les barbares d'eleves") only served to quicken 

 their determination not to be thus baffled, and improvised " keys " 

 soon left matters in a worse condition than if no such means had been 

 adopted in the first instance. 



Messrs. Murray and Heath's Class Microscope (fig. 101) has 

 similar arrangements for locking the parts liable to be disturbed. 



Fig. 101. 



The body-tube is locked by a pin near the top of the socket in which 

 it slides, the fine adjustment being effected by the eye- piece. The 

 slide is placed in a shallow box, which can be locked in the same way. 

 The box, which is movable on the stage, can be fixed when desired 

 by two screws beneath the stage also set fast by the key. A fourth 

 locking arrangement in the limb fixes the Microscope in a horizontal 

 position. 



Giacomini's Microscope with large Stage.* — Herr Schieck has 

 already devised a Microscope f with a large stage to meet the wants 

 of observers who have to deal with large sections. The stage is 



* Sep. Repr. Giorn. R. Accad. Med. Torino, 1883, fasc. 6, 8 pp. and 2 figs, 

 t See this Journal, ii. (1882) p. 673. 



2 L 2 



