DISSECTING AND MOUNTING MICROSCOPE. Ill 



3. The achromatic condenser, fitted with stops, giving a good 

 black-ground effect, works by a milled head above the stage, and 

 conveniently near the other adjustments. 



4. The rest for the hands while dissecting which the stand gives 

 is equally available when the binocular is being used for general 

 observation. It is comfortable, and I hope will be found to increase 

 delicacy in the manipulation of objects. 



Though rigid, the stand can be made lighter than can that of 

 the ordinary form. 



I take it that the whole apparatus will not be more weighty 

 than an ordinary binocular instrument ; while it will, with all the 

 helps to dissection, mounting, and observation, pack in a space 

 not larger than ordinary small monocular instruments. 



A larger number of cements could be carried if the bottles were 

 of a slightly smaller size. 



I should propose that, instead of the outside case being of 

 polished mahogany, it should be of painted canvas, such as port- 

 manteaus are made of. 



The above was specially constructed for travelling, but might 

 perhaps be useful to workers, as comprising in a small compass 

 many things necessary for microscopical work. 



