42.2 Dr. B. Jones on the Passage of Crystalloids [1865. 



At 6.30 P.M it was killed. Rubidium was not detectable anywhere ; not 

 even satisfactorily in the urine. 



Another guinea-pig was given ten grains of chloride of rubidium at 

 11.20A.M. At 3 P.M. scarcely any rubidium could be detected in the 

 urine. The following day, at 1 1 A.M., it was given five grains more. At 

 2 P.M. rubidium was just detectable in the urine. The next day, at 2 P.M., 

 it was again given five grains, the rubidium being just perceptible in the 

 urine. Twenty-five hours afterwards it was killed. 



Extremely minute traces of rubidium were found in the kidney and in 

 the blood ; somewhat more, but still very faint traces, in the liver. In the 

 cartilages no rubidium could be found, nor in the aqueous humour of the 

 eye. When the whole lens was incinerated at once the smallest possible 

 trace of rubidium was found. The urine showed traces of rubidium. 



An elderly man took nineteen grains of chloride of rubidium four hours 

 before he was operated on for cataract. The most careful search could not 

 find any rubidium in the lens after its removal. 



Another patient, with a double cataract, was given twenty grains of 

 chloride of rubidium. One lens was extracted ten hours afterwards, and 

 the other seven days afterwards, but in neither could traces of rubidium be 

 found. 



It was found by experiment that 1 6 ^ - of a grain of chloride of rubi- 

 dium in water was detectable by the spectrum analysis. -^^Q of a grain 

 in urine could be distinctly observed. 



On the Passage of Chloride of Caesium into the Textures. 



Delicacy of the reaction for Ccesium. One grain of chloride of caesium 

 in 400 cub. centims. of water just gives the blue caesium lines in a quantity 

 of solution that can adhere to the loop of a platinum wire which took up 

 0'05 of solution. The * part of a grain of chloride of caesium in 

 water can be detected. If potassium is present in the same solution the 

 test is much less delicate. 



In urine, one grain of chloride of caesium in 200 cub. centims. is the 

 limit of the reaction for a quantity remaining on the loop of the same wire 

 as was previously used. Hence 62> 1 500 of a grain of chloride of caesium in 

 urine can be detected. 



A guinea-pig was given three grains of chloride of caesium, and twenty 

 hours afterwards another three grains. Twenty hours after the second 

 quantity it waB killed. The ash of the urine showed caesium slightly. 

 No caesium could be detected in the two lenses taken for one examination ; 

 nor in the liquid humours of the eyes. A small portion of the ash of the 

 kidneys and liver showed no caesium, but aqueous extracts, after con- 

 centration, showed caesium' faintly. No caesium could be detected in the 

 blood, nor in the bile. 



A guinea-pig was given six grains of chloride of caesium, and six grains 

 more nineteen hours afterwards ; twenty-four hours after the second dose 



