APPENDIX III. 181 



2. Experiments on Animals to which Salts of Lithium 

 were given, upon the Hate of the Passage into the 

 Textures. 



Experiment 1. Two guinea-pigs were fed for 

 several days on the same food. One was killed, and 

 the urine, the nails, hair, blood, bones, muscles, 

 nerves, cornea, and crystalline lens were examined 

 by the spectrum, and no trace of lithium was found 

 anywhere. The other was given half a grain of 

 chloride of lithium for seven days, and for two days 

 one grain. It was then killed, and the lithium was 

 found everywhere, even in the cornea, crystalline 

 lens, hair, and toe-nails. In these it was more 

 distinctly present than anywhere else, so that it 

 probably came from the urine. 



Experiment 2. Another guinea-pig, fed on the 

 same food as the first two, was given only half a 

 grain of chloride of lithium for three days. The 

 third morning the lithium was detectable, by 

 analysis, in the hair ; the fourth day it was killed, 

 and the lithium was found everywhere, as in the 

 last instance. 



Experiment 3. Another, after the hair and nails 

 had been examined for four days and no lithium 

 found, was given three grains of chloride of lithium. 

 In two hours and a half lithium was detected in the 

 hair of the belly, though in six hours none was 

 found in the hair of the back ; much more was then 

 in the hair of the belly. In twenty-six hours it 

 was killed. Lithium was found everywhere both 

 in the outer and inner part of the lens very dis- 



