110 Sir G. B. Airy, On the state of an eye, <Lx. [May 23, 



II. Distance from the cornea of the left eye at which a 

 luminous point presents the appearance of a nearly vertical line. 



Reciprocal = 166 ; Difference = _ -054. 



In 1825, 60 inches 



In 1846, 8-9 



In 1866, 10-6 



In 1871, 100 



In 1881, 13-75 



112; 



•094 ; 

 •100; 

 •073. 



-•018. 

 + 006. 

 - -027. 



III. Measure of the astigmatic power of the left eye at different 

 epochs; estimated in each case by the difference of the reciprocals 

 for the same date in the two preceding tables. 



In 1825, Astigmatism = '120; 



In 1846, -101; 



In 1866, -091; 



In 1871, -079; 



In 1881, -101. 



Difference = - '019. 



--010. 



-012. 



+-022. 



IV. Distance from the cornea of the right eye, at which 

 a luminous point is seen distinctly. 



In 1846, 4-7 inches ; Reciprocal = '213 ; 



In 1866, 5-5 ; '182; 



In 1871, 54 ; 185; 



In 1881, 60 ; -167. 



Difference = - -031. 



+-003. 



--018. 



The image formed by the right eye is very perfect ; although 

 there are anomalous spots on the cornea or crystalline, and appear- 

 ances which suggest a fault in the retina. 



(3) On the mechanism of the renal secretion. By C. S. Roy, M.D. 



The observations which formed the basis of this communica- 

 tion were made in part during the summer session of last year in 

 conjunction with Professor Cohnheim, at the Leipzig Pathological 

 Institute, and in part during the last autumn and winter in the 

 physiological laboratory of this University. They were commenced 

 with the hope of being able to elucidate a number of questions 

 bearing upon the relation which exists between certain diseases of 

 the kidney and cardiac hypertrophy. 



It was first sought to obtain information upon this subject by 

 investigating the manner and extent to which the action of the 

 heart is affected by obstruction of the renal arteries and the other 

 large branches of the aorta; the facts obtained by taking this line 



