42 MICROSCOPIC OBJECTS. 



sigera, of Fabricius, of the natural size, and magnified : 

 Fig- 6. when examined with a weak magnifier 

 the surface appears punctured, but when 

 under the microscope it is seen to be 

 covered with hexagons, as in the figure : 

 in the centre of each hexagon is a small 

 hair : the surface of the insect's body 

 is similarly marked. It is found in Italy, Switzerland, 

 France, and Germany. 



The scales of fish are beautiful subjects for exami- 

 nation. Figures 7 and 8 represent the scales of a sole, 

 of the natural and enlarged size ; the dentated end is 

 that which lies without the skin, the other end is at- 

 tached to it. 



Fis. 7. 



Fig. 8. 



The following is an easy method of preparing salts nud 

 saline substances for viewing their configurations : 



The subject to be examined must be dissolved in no 

 larger a quantity of river or rain water than is suffici- 

 ent to saturate it ; if it is a body easily dissolvable, 

 cold water must be used, otherwise the water must be 

 made warm, hot, or even boiling, as necessary. After 

 it is perfectly dissolved it must rest for some hours, 

 till, if over charged, the redundant saline particles are 

 precipitated and settle at the bottom, or shoot into 

 crystals, by which means a solution of the same 

 strength is as likely to be had at one time as at an- 

 other ; that is, a solution fully charged with as much 



