INVERTEBKATA, CRYPTOGAMIA, MICROSCOPY, ETC. 



713 



Fig. 



cent., and as the figures were more readily distinguishable 

 Trichince, the error in the latter case 

 will jn-obably be still greater, and a 

 matter, therefore, of some importance. 

 The construction and advantages of 

 this mechanical stage are described by 

 the inventors somewhat on first prin- 

 ciples (much in the same way as the 

 matter would have been dealt with 

 fifty years ago in this country), and 

 appear to show a greater want of fa- 

 miliarity with mechanical stages than 

 we should have supposed to exist. 



With the Microscope are supplied 

 the two long strips of plate glass 

 shown in the figure, between which 

 specimens of the meat to be examined 

 are placed. The lower and thicker 

 one has five squares drawn upon it, 

 each measuring a square (German) 

 inch. 



Waeclders. * — The describer of 

 this form suggests that, ingenious as 

 the construction of the one previ- 

 ously mentioned is, it possesses several 

 drawbacks, one of which is that " it is 



than 



Fig. 61. 



' I'liariiiiiccutiaclif (.Vntialliullc,' i. (1880) \k 102. 



