134 



HARDWl CKE ' S S CIENCE- G O SSI P. 



bar upon the file cut, and draw it slowly and evenly 

 round the tube ; by this means I have managed to 

 get it to part so evenly as to require but little facing 

 afterwards ; cement the tubing to one end of the 

 slide ; this constitutes the reservoir. Kext take a 

 piece of the best blotting-paper, or^ filtering paper 

 will do equally as well, cut it of such a width as will 

 permit it to lie evenly between the sides B B on the 

 plate A, and also allow of its expansion when saturated 

 with water ; if this be not particularly attended to the 

 paper will rise up from the plate at the sides and 



distant from the sides of the slide, for convenience in 

 making observations, as represented in Fig, lOO. 



For the sake of cleanliness, I have a lid or cover to 

 my slide : see Fig. 98. 



u is a piece of glass of the same kind as slide, 

 5 inches in length and 2\ inches wide, hollowed out 

 at the end so as to shut up close to the reservoir, and 

 also to allow the syphon to pass on to blotting-paper. 

 On the slide E E are two shoulders, consisting of glass 

 about fg of an inch in width, cemented flatways on D, 

 at such a distance as to permit of the sides B B in 



a 



Fiq 



99. 



0000 



o o o c 



Fig. 100. 



v///;/. - wy//y;- '. - ■'/,w . w,-/' - v>;;','.y . '^////.^ i ' 



m 



'' •": ....,,,..,,. ^.,.g..,.,_...,„..,. . , . , ,..,. ■ 



Fig. loi. 



Fig. 102. 



cause considerable inconvenience ; let the paper be 

 •of such a length as when it is placed against the 

 reservoir it will project one inch beyond the slide at 

 the opposite end. This end of the paper should be 

 cut to a point, so as to lead the water from the plate 

 ■or slide into a receiving vessel ; next cut the cells in 

 the paper with a very keen steel punch such as is used 

 for leather, the size depending on the use for which 

 they may be required ; for algx> I have two sizes, some 

 one quarter and others three-eighths of an inch. The 

 number I leave to the operator's decision, but if he has 

 two rows on one slide, which he may without any in- 

 convenience, be sure and have them in line, and equally 



Fig. 97 to come between them, so that the cover may 

 slide easily backwards or forwards as required. 



This completes our slide, with the exception of the 

 syphon, which may consist of a single thread of wool 

 or worsted. I use the latter. 



I will now proceed to describe how to use it. First 

 remove the cover ; select your object, and have it in 

 perfect readiness ; remove the paper and well saturate 

 it with water, and replace it evenly on the slide ; then 

 take a piece of glass about J inch in width and lay it 

 across the slide upon the paper at the end farthest 

 from the reservoir to dam up the water, that the cells 

 may be kept filled during the process of putting the 



