290 On Cutaneous Absorption. 



the rubia tbictorum, and remained in it two hours and 

 forty-five minutes. The urine discharged immediately 

 after leaving the bath was pale, and considerable in 

 quantity. Three hours afterwards, the urine was again 

 discharged ; it was slightly tinged with red. The 

 bladder was not again emptied till the following morn- 

 ing ; and, though the time elapsed was ten hours, the 

 urine had no perceptible redness, and in appearance 

 was nearly or quite natural. Treated with a solution of 

 the common sulphat of iron, the highest-coloured por- 

 tion of urine gave a tinge of a purplish-brown. The 

 other portions, treated in the same way, were not sen- 

 sibly changed in their colour. 



EXPERIMENT II. 



March 23, I continued three hours in the madder- 

 bath. On leaving it, the urine was, as before, pale, and 

 considerable in quantity. Five hours after, the urine 

 discharged was strongly tinged with a reddish colour. 

 Three hours from this, it was much paler ; and the 

 next morning, or eighteen hours after leaving the bath, 

 the urine discharged was of its natural paleness. The 

 portion discharged five hours after leaving the bath was 

 a little deeper coloured than common Sherry or Sicily 

 wine. Treated with the sulphat of iron, a strong 

 purplish-brown precipitate was produced. With the 

 same test, the urine drawn seven hours after coming 

 out of the bath gave much less of the colour; the suc- 

 ceeding portions gave more. 



