Ixx CONTENTS. 



ARTICLE II. 



On a supposed consequence of the duration of impressions 

 upon the retina ; and the effects of accurate vision being 

 confined to a single point of that membrane . page 86 



ARTICLE III. 



On the connexion between the different refractive states of 

 the eyes, and the different inclinations of the optic axes to 

 each other . . . . , .94 



ARTICLE IV. 



On the limits of perfect and distinct vision . . 1O/ 



ESSAY ON DEW 



AND 



SEVERAL APPEARANCES CONNECTED WITH IT ug 

 Introduction . . . . . 123 



PART I. 



OF THE PHENOMENA OF DEW. 



SECT, i. Of circumstances which influence the production 

 of dew . . .. . . .127 



SECT. ii. Of the cold connected with the formation of 

 dew . . ; :. . . 152 



PART II. 



OF THE THEORY OF DEW. 



Former theories . . . . . ] 77 



A NEW THEORY PROPOSED. 



Deto is the production of a preceding cold in the substances 

 upon which it appears . . . .181 



