CONTENTS. 



CHAP. VIII. 

 Of the Animalcula Infuforia, p. 454. 



xxiii 



C H A R IX. 



On the Organization or Conftruftion of Timber, as viewed by 

 the Microfcope, p. 652. 



CHAP: X. 



Of the Cryftallization of Salts, as feen by the Microfcope ; 

 together with a concife Lift of Objeds, p. 68o* 



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ESSAYS 



