Mrs. Griffiths on the Spectra of the Eye and Seat of Vision. 195 



oblong drops in the centre answers to what Mr. Horner calls 

 " golden rain"; but the brilliancy and golden hue originate 

 in the colour of the light, for a ray of the sun gives it a silver 

 colour. I have described the whole in p. 306. of Our Neigh- 

 bourhood. At first, before T could keep my eye steady, I 

 only saw the quarter, and oftentimes a very small sector, of the 

 spectrum; now I see the whole at once. 



Right Eye. Left Eye. 



In front of this spectrum are to be seen, as below in No. 1 . 

 and No. 2., the loose air- bubbles and connected links, all 

 moving various ways and changing their position and con- 

 nexion with one another every instant. 



No. 1. 



In No. 1. I have merely represented the water which flows 

 in the aqueous chamber ; in No. 2. I have represented the 

 transparent air-bubbles, and the links of these same bubbles. 

 They are sometimes so fine as to have the appearance of a 

 transparent cambric thread. All these are perpetually float- 

 ing about in the fluid of No. 1., which is in constant motion, 

 rising and falling like waves. 



In a future communication I shall give you these images 

 very highly magnified, but at present I thought it better to 

 show them as they appear by the aid merely of the magnifying 



8 v 2 



