Microscopical Essays, 



Many of the ichneumon flies, fpheges and wafps, head of the 

 hornet, fling of ditto, collectors of the bee, many forts of mufca^ 

 or flies with two wings, efpecially thofe whofe bodies are highly 

 coloured ; acari, or ticks ; phalangium cancroides, vide Plate 

 XVIII. Fig. 1 and 6. Some fpiders, but the eyes of all ; the 

 dnifcus or wood loufe, julus, and fcolopendree. 



The feathers of peacocks, and many other birds, have a grand 

 effect when viewed in the opake microfcope, as have alfo fome 

 fpecies of ferns, moffes, and wood cut tranfverfely. Madrepores, 

 millepores, fponges, corralines, &c. exhibit wonderful appear- 

 ances, not difcernible to the naked eye. Parts of echini or fea 

 eggs, fpines of ditto ; thefe may alfo be cut tranfverfely, to fhew 

 their conft.ruct.ion. Minute fhells differed, fkin of many fpecies 

 of fifh, particularly the lump fifh, Plate XVIII. Fig. 2. Soal, 

 and the rafp fifh from Otaheite, alfo the fkins of fnakes, lizards, 

 guanas, Sec. Sec. An endlefs variety will be difcovered in* 

 feeds. 



The exterior form, and even the internal ftruclure of the gene- 

 rality of vegetable feeds, have been fuppofed by fome fo much 

 alike in the feveral kinds, and of fo little curiofity and beauty in 

 the whole, that they have fcarcely been regarded by the curious ; 

 but when nearly examined, with the help of microfcopes, they 

 are found to be worthy of a greater attention ; thofe which ap- 

 pear moft like to one another, when viewed by the naked eye, 

 often proving as different when thus examined, in their feveral 

 forms and characters, as the different genera pf any other bodies 

 of the creation. If their external forms carry all this variety and 



4 P 2 beauty 



