CLASS-BOOK OF ZOOLOGY. 127 



6. Two-winged Insects, (Diptera,) those which have 



two wings ; as Flies. 



7. Wingless Insects, (Aptera.) those which have no 



wings ; as Scorpions, Lobsters, Crabs, Spiders, 

 Fleas, and all Parasites which live upon animal 

 bodies. 



Remarks. — I. No class of animals have attracted more 

 attention, than that of Insects. An immense number of 

 elegant works, embellished with costly engravings, have 

 been published in different countries on the subject of 

 entomology. Governments, Universities, and Societies 

 of Natural History have established large entomological 

 cabinets, in which the Insects of the different parts of the 

 world are preserved and systematically arranged. Many 

 of the most distinguished philosophers seek them in fields 

 and meadows, to examine th:ir organization and ascertain 

 their nature ; they place them in elegant cases, where 

 they are displayed like paintings ; they even raise them 

 in rooms, in order to loose nothing of the splendor of their 

 dresses. This delightful occupation, far from being a 

 trifling amusement, is a useful study ; at the same time 

 that it is one of the purest, most instructive, and health- 

 ful amusements. In its pursuit was discovered the use 

 of the Blister-beetles ; of different species of Bees ; of 

 several Butterflies, which produce silk or other stuffs ; 

 and of some other insects producing precious coloring 

 substances, as well as those from which we obtain the 

 finest varnish. 



II. As regards the collecting of Insects, it will not be 

 amiss to mention, that the collector of Beetles, Bugs, and 

 Wingless Insects must be provided during his excursions 

 with a wide-mouthed vial, containing a small quantity of 

 whisky, in which to secure them. After having returned 

 home, he must, to preserve them, run a long pin or needle 

 through the right wing and body, and then place them in 

 a box, the bottom of which should be covered with a coat 



