Dr. Reuben on Moving Blood-corpuscles within the Retina. 325 
whole reef possess, so far as it goes, one unbroken outer of 
2 bot 
We may not live to see it, but we oan that this sand see 
will yet become ficed—will enlarge itself—catch some floating 
seeds and appropriate them and then there will be another green 
islet on the reef. This will again expand itself and become the 
connecting link of Ebon and Eni-armath—thus completing the 
_ length of the green band of this Ebon islet on its northern ex- 
tremity. 
"Ebon Atoll, Marshall Island, Micronesia, Aug. 16th, 1860. 
Art, XXIX.—On Normal quasi- Vision of the Moving she 
Revie within the Retina of the Human Eye; by LEV 
EUBEN, M.D. 
I. Wuixe observing, in the summer of 1857, the apparent 
changes in the colors of natural bodies, due to transmission of 
the light from them through various colored media , L looked 
| The, eatliodl impression was that some of the lucid objects 
showed as mere points, others as bead-like bodies. The bead- 
form is, however, in this experiment, an Briere ‘ed due to a 
quick circuitous movement of some of t ts. 
2. The movements were by regular ent Se or in jets; 
as if, at each jet a new troop of “these objects entered siidelenly 
in all parts of the field of bee “reg as the eye would 
pronounce, distances varying from ¢ to 3 of a rap oe and ag 
whole of a pulsation 
