56 Objects for the Microscope. 



their parts; reading at the same time, from Cuvier, or 

 Westwood's ' Introduction to Entomology/ the generic 

 characters of the Coleoptera and Diptera, and the young 

 entomologist will have received a lesson never to be forgotten. 



For those who have not begun the study of natural 

 history, a few words are added on the classification of 

 insects generally, without which some descriptions may be 

 unintelligible. 



Insects are so called from the word in-sccta, their bodies 

 being divided into many distinct segments. They are a 

 class of invertebrate articulated animals. The head is 

 always distinct and furnished with antennae ; the body 

 usually consists of thirteen segments ; they breathe by 

 means of trachea? ; possess a nervous system, a circulation 

 of blood, and a digestive apparatus varying with the 

 necessities and habits of the species. 



According to Cuvier's arrangement, insects are divided 

 into twelve orders. The first four orders have no wings. 



1. Myriopoda, example and 



2. Thysanura Lepisma, or Sugar-louse 



3. Parasita Pediculus (Louse) 



4. Suctoria Pulex (Flea) 



5. Coleoptera Beetles 



6. Orthoptera Grasshoppers, Crickets 



7. Hemiptera Bugs, Aphides 



8. Neuroptera Dragon-flies 



9. Hymenoptera Bees, Wasps, Ichneumons 



10. Lepidoptera Butterflies, Moths 



11. Strepsiptera Stylops 



12. Diptera Flies 



The objects themselves will be the best illustrations of 

 these orders. 



Preparations of animal tissues, blood, injected respiratory 

 and digestive organs, and other objects relative to the 

 physiology of the human body, are reserved tor a separate 

 pamphlet. 



