3j4 Letter from Ezeliiel fFalkcr, Esq. 



I shall not enter into any further detail upon the branze 

 statues of Roine, since this subject has been treated by 

 Winckelnian, who has made particular inquiries as to the 

 causes which contributed to their destruction. 



[To be continued.] 



LVII. Letter from Ezekiel Walker, Esq. 



To Mr. Tllloch, 



HE ninth number of the Retrospect conto-ins some further 

 observations on rav paper in the xxivih volume of the Phi- 

 losophical Magazine, p. 240, which might liave been passed 

 over without any reply, had not the writer used my silence 

 as an argument to persuade his readers that I had drawn my 

 facts from Berkeley's Theory of Vision. 



This writer tells us, p. 236, that "■ Mr. Walker attempts, 

 as he says, to demonstrate a certain property of the eye in 

 two ways. In the first he makes a parade of algebraical 

 substitutions, although there is no bringing of terms to an 

 equation, no transposition, no extrication of known from 

 unknown terms ; yet, after all, he does not demonstrate the 

 property of the plano-convex leas, but merely says in 3. not? 

 that it is v.'cll known to mathematicians. 



" The second demonstration is vague and loose in the 

 extreme ; and where he reasons from the assumed case of a 

 plano-convex lens to that of the lens of the eye, none of 

 which are plano-convex, he evidently shifts bis hypothesis 

 before the conclusion is drawn. 



" We have already said that Mr. Walker's pretended ex- 

 ■ planation is only an elucidation of that heretofore given by 

 Berkeley, and we cited a passage from section 68 of that 

 author's New Theory of V^ision. Now, although Mr. Wal- 

 ker carefully avoids any allusion to what Dr. Berkeley has 

 done, we desire oiir readers would compare Mr. Walker's. 

 additional facts in his last letter with the 70th and 7 1st sec- 

 tions of Berkeley, and they will at once perceive the source 

 whence these facts were drawn." 



In answer to these observations I beg leave to say, first, 



t'h^t 



