COLLECTION, EXAMINATION, ETC. 325 



protoplasm, whilst the nucleus and nutritive particles 

 take up the carmine. The cover glass is next placed 

 beside a slip and gently warmed in a water bath, at 

 the same time introducing a drop of fluid glycerine 

 jelly beside the object. This will presently run in, 

 and a minute piece of the jelly having been melted 

 upon the glass slip, the cover glass can be turned 

 over on to the slide. Extreme care must be taken 

 during this operation, so as not to displace the fragile 

 object. When cold the superfluous jelly may be 

 removed with a damp cloth and the mount sur- 

 rounded with a ring of gum arable, and finally with 

 varnish. 



AiJpavatns used i/i drawiiuj the Foraiuiiiifera. — It 

 is hardly necessary to give many details on this 

 branch of the subject in a book of small pretensions, 

 such as this ; especially since much valuable informa- 

 tion is always available in the well-known works of 

 Carpenter on ' The Microscope ' and Dr. Beale on 

 ' How to work with the Microscope,' not forgetting 

 several of a similarly useful character lately published. 



The camera lucida is to some workers a very indis- 

 pensable piece of apparatus ; the two best known 

 forms being Wollaston's prism and Beale's neutral 

 tint reflector. Many persons, however, have not found 

 these accessories necessary, but trust rather to drawing 

 and measuring alternately, so as to ensure accuracy. 

 It is, however, better to employ a form of camera 

 lucida in getting the outlines of the objects, when 

 the detailed tilling in may be done with more freedom. 



Another extremely useful piece of apparatus 



