42 VISION UNDER WATER. 



lead, several small matters adhering to the egg and atl 

 air bubble of one twentieth of an inch diameter, w hich 

 adhered to the buckle. 

 The eye saw ^Ve all remarked that the appearance under water, to 

 best at first im- fj^c naked cyc, became loss distinct after the eye had been 

 a second or two under the water than at first. I do not 

 a})prehcnd why tiiis should be the case. 

 Conclusion I'^rom the preceding facts as well as from optical con- 

 that the human siderations, it appears to be established that men and" 

 tuT uUh"obect3 P^'O^^bly all animals which live in the air, are incapable of 

 underwater, varying the adjustment of the eye, so as to distinguish 

 objects, with even a very small degree of precision, at a 

 very remarkable distance from that organ immersed in 

 water. Instead however of reasoning, as my correspon- 

 dent has done in his fourth paragraph, I am disposed to 

 question whether a farther enquiry into the facts, 

 with different individuals, might not shew that some per- 

 sons may be capable of altering the form of their eyes 

 enough to see imperfectly in the situation we have been 

 contemplating ; but 1 must confess that I do not incline 

 to that opinion. 

 Another In- Since I wrote the paper in my last, I have heard of 

 stance of a per- another well authenticated instance of a man who had 

 at firsttim? "^ "^^'^^'^ attempted to swim, but who, on the occasion of 

 having fallen from a barge into the Thames, supported 

 himself for a considerable time by striking his hands 

 downwards alternately, until a boat, for which he loudly 

 calledj came to his assistance. 



VI. 



iJf'yfory of the Dcv elopement of the Intellect and Moral 

 Conduct of an Infant during the first Twelve Days of 

 its Existence. In a Letter from R. B. 

 To Mr. Nicholson. 

 Sir. 



Introduction •^iX years ago I communicated to a respectable periodical 



to this memoir, publication, a register of the moral conduct of an infant for 



the first twelve days of its existence. That work was soon 



afterwards discontinued, which prevented my communica- 



l ting 



