PART II. 



OBJECTS FROM THE ANIMAL KINGDOM. 



" The desire which tends to know 

 The works of God, thereby to glorify 

 The great Work -master, leads to no excess 

 That reaches blame, but rather merits praise 

 The more it seems excess ; 

 For wonderful indeed are all His works, 

 Pleasant to know, and worthiest to be all 

 Had in remembrance alway with delight." Milton. 



THE slides usually prepared from the animal kingdom 

 consist of insect parts, palates of Molluscs, Zoophytes, and 

 miscellaneous objects, rather difficult to classify, since 

 they seem to be mounted chiefly to please the eye of the 

 purchaser. 



The demand for " pretty objects " has been caused by the 

 absence of any plan for the proper use of the microscope ; 

 but now that we begin to find its real use, and appreciate 

 its value as an educational instrument, the optician will 

 have a better selection of slides on sale, and each object 

 will be chosen as much for its usefulness as for its beauty. 



There is a class of slides now sold by several opticians, 

 which deserves especial recommendation. They are insects 

 mounted whole ; one single preparation affording material 

 for a day's study at least. Instead of isolated parts be- 

 longing to unknown insects, we have the perfect body of 

 Fly or Beetle, displaying its external anatomy, and giving 

 us such an insight into its structure as we should hardly 

 acquire with much reading and the best-drawn illustration. 



Take, for instance, the slide of Scatophaga, or common 

 Dung-fly, and read the description in this catalogue ; or 

 the Telephorus Beetle ; and compare the two carefully in all 



