1865.] into and out of the Vascular and Non-vascular Textures. 417 



eye. There was, however, a perceptible difference between the amount of 

 lithium in the inner and outer part of the lenses. 



Two other sheep's eyes had a small portion of the cornea in front and the 

 sclerotic removed at the back ; they were then placed in a moderately strong 

 solution of chloride of lithium, and the aqueous humour was examined from 

 time to time. 



After eighteen hours the aqueous humour showed lithium distinctly, 

 and when the lens was extracted the lithium was found throughout its 

 substance. 



Two other eyes were placed whole in a solution containing one-tenth of 

 a grain of chloride of lithium to one litre of water. 



In twenty-four hours the lithium had penetrated the entire eye. No 

 difference was perceptible in different parts of the lens. 



The rate at which a solution of chloride of lithium diffused through the 

 stomach of a fresh-killed guinea-pig which had taken no lithium was de- 

 termined. 



A solution of one grain of chloride of lithium in twenty grains of water 

 was put into the stomach, and it was hung up so that the solution gravi- 

 tated to the lowest part. The outer side of the stomach opposite the 

 solution was touched from time to time with a loop of platinum wire, which 

 was afterwards tested for lithium. 



In first minute. No lithium came through the stomach. 



In second minute. No lithium. 



In third minute. No lithium. 



In fourth minute. No lithium. 



In fifth minute. No lithium. 



In sixth minute. Traces of lithium. 



In seventh minute. Traces of lithium. 



In eighth minute. Lithium was very distinct. 



The stomach of another guinea-pig was filled with a solution of lithium 

 containing one grain of lithium in about half an ounce of water. The 

 stomach was entirely filled and laid flat on a plate. The ends of the 

 stomach and round the side showed lithium coming through in four minutes. 

 The upper part of the stomach showed the lithium coming through in 

 fifteen minutes. 



5. On the Presence of Lithium in Solid and Liquid Food. 



An ounce of each substance was taken. It was dried or evaporated, and 

 incinerated carefully at a low red heat in a muffle on a platinum tray. The 

 ash was tested for lithium first by taking a small fraction on a loop of a 

 platinum wire into the flame of the spectroscope. When no lithium was 

 thus detected, the ash was treated with sulphuric acid, and heated to expel 

 the excess of acid ; the dry residue was extracted with absolute alcohol, 

 the solution filtered, evaporated to dryness, and the residue taken up in a 

 drop of water and tested by the spectroscope. 



