262 Mr.W. G. Horner on the Vascular Spectrum. 



should have valued the honour done him by his notice, had 

 he been at all aware that such a paper existed. 



I have the greater pleasure in giving this public explana- 

 tion on behalf of Mr. Northmore, since it affords me an op- 

 portunity of stating, that admiring as I do the genius and the 

 discoveries of Mr. Faraday, I should have been the last per- 

 son to give publicity to a single word to his demerit, if I had 

 not been previously informed that the whole passage merited 

 implicit reliance. From an impression, however, that it would 

 be unjust to allow Mr. Faraday to remain uninformed of the 

 terms in which he is there spoken of, I availed myself of the 

 first opportunity afforded me to place the work in his hands, 

 for the purpose of ascertaining the accuracy of Mr. North- 

 more's charge against him; and I am happy in being able 

 to remove the conclusion to which that charge might lead. 

 As Mr. Northmore's letters on the organic treasures of the 

 caves of Devon are authenticated by his name, and as he is 

 well known in that county as an ardent antiquary, and as a 

 public character in other ways, I considered that he would be 

 held responsible for their contents, — and that although pub- 

 lished in my work, their insertion would not render me 

 amenable for his sentiments and theories. 



I trust, Gentlemen, that you will, in justice to Mr. Fara- 

 day and myself, oblige me by the insertion of this letter in 

 your valuable periodical. 



I am, Gentlemen, yours, &c. 

 London, Feb. 27, 1834. OcTAVIAN BLEWITT. 



XLVI. On the Autoptic Spectrum of certain Vessels within 

 the Eye, as delineated in Shadow on the Retina. By W. G. 

 Horner, Esq. 



To Richard Phillips, Esq., F.R.S., $c., Co-Editor of the 

 Philosophical Magazine and Journal. 



Dear Sir, 

 r |' , HE paper on the Vision of the Retina, in your Number for 

 -*■ this month (January) brought to my recollection a more 

 explicit and diversified statement, which appeared in the first 

 number of the late Journal of the Royal Institution, in the 

 form of " Contributions to the Physiology of Vision." The 

 author gives his initials C. W. (C. Wheatstone ?). 



On turning to that paper, my attention was fixed by the 

 writer's description and views of an experiment performed 

 by him, after Purkinje and Steinbuch, in which the experi- 

 menter is said to observe " the blood-vessels of the retina." 



