E S S A Y S 



ON THE 



MICROSCOPE; 



CONTAINING 

 A PRACTICAL DESCRIPTION OF THE MOST IMPROVED 

 MICROSCOPES: 



A GENERAL HISTORY of INSECTS, 



THEIR 



TRANSFORMATIONS, PECULIAR HABITS, and CECONOMY r 



AN ACCOUNT OF THE 



VARIOUS SPECIES AND SINGULAR PROPERTIES OF THE 



H Y D R JE and V O R T I C E L L /E : 



A DESCRIPTION OF 



Three Hundred and Seventy-Nine Animalcula, 



WITH A CONCISE 



CATALOGUE of INTERESTING OBJECTS; 



A VIEW OF THE 



ORGANIZATION of TIMBER, 



AND THE 



CONFIGURATION of SALTS when under the MICROSCOPE. 



By G E O R G E a' D A M S, .. 



MATHEMATICAL INSTRUMENT MAKER to- His MAJESTY, and OPTICIAN 

 to His ROYAL HIGHNESS the PRINCE of WALES. 



L 0 N D 0 N: 

 Printed for the AUTHOR, by ROBERT HINDMARSH, Printer to 

 His Royal Highness the Prince of Wales, No. 32, Clerkenwell- 

 Close ; and Sold by the Author, at his Shop, Tycho Br auk's. 

 Head, No. 60, Fleet-Street. 



MJXX.LXXXVII. 



