416 



MANIPULATION. 



microscopic observation; the latter genus was especially 

 abundant at Heme Bay, in September, 1848, where it 

 might be picked up in profusion on the beach, being 

 attached to a variety of sea-weeds. For a full description of 

 the various British species of Zoophytes which may be met 

 with either in fresh or salt water, the excellent work of 

 Dr. Johnston, before quoted, should be consulted. 



Insects. — This division of the animal kingdom affords to the 

 microscopist the most numerous and, perhaps, the most beau- 

 tiful class of objects for examination, as there is scarcely a part 

 of the body of an insect that does not exhibit some remark- 

 able structure. In the following classified list are enumerated 

 some of the insects in which certain parts and organs may 

 best be viewed : — 



Antenna. 



Cockchafer, 

 Cockroach, 

 Gnat, 



Plumed Gnat, 

 Midge-fly, 

 Poplar-hawk Moth, 



Blow-fly, 



Cabbage-butterfly, 

 Cockroach, 

 Field Cricket,' 



Buprestis, 

 Cockchafer, 

 Ciciadela germanica, 

 maritima. 



Eggs. 



Ichneumon, 

 Lacquey-moth, 

 Magpie-moth, 

 Privet-moth, 



Elytra. 



Dermestes, 

 Diamond-beetle, 

 Dyticus, 

 Mantis, 



Privet-hawk Moth, 



Staphylinus, 



Tiger-moth. 



Red underwing-moth, 



Silkworm, 



Spider, 



Water-scorpion. 



Musk-beetle, 

 Notoneeta, 

 Kose-beetle, 

 Unicorn-beetle. 



The elytra of the various kinds of diamond beetles are 

 amongst the most brilliant of all opaque objects; some of 

 them are much improved by being mounted in a thick cell 

 with Canada balsam, in the manner described at page 308, 

 whilst others lose much of their splendour by being so treated. 

 In order to ascertain whether an elytron wiU be improved by 

 the balsam, one of the legs, or some part supplied with a few 

 of the u-idescent scales, should be touched with turpentine : if 

 the briUiancy be increased, the mounting in balsam should be 



