OBSERVATIONS ON THE STRUCTURE OF THE TONGUE. 47 



an unexpected effed: the ice perceptibly diminiihed, and they 

 were obh'ged to pull down the wall, which was in fome mea- 

 fure an obftacle to the evaporation, I faw the remains of this 

 wall, and the inhabitants of Grace Dieu confirmed to me the 

 fa.€t mentioned by Mr. Ravier. 



The formation of the ice in this curious grotto, therefore. This Ice ftated 

 may be explained, I believe, according to the theory of the ^^ ^^ formed m 

 jars that ferve to cool the water they contain in hot countries, as water in 

 by permitting part of the fluid to tranfude through their po- porous jars is 

 rous fides. countries by the 



As no natural philofopher has yet attempted to explain this evaporation 

 interefting phenpmenon, I have flattered myfelf that I might ^[J^ 

 be indulged in a conjecture, founded on phyfical principles 

 fully eftabliflied by experience. 



viir. 



Obftrvatiom on the StruSture of the Tongue: illufir^ted by Cafes 

 in which a Portion of that Organ has been removed by Liga-- 

 tare, Bi/Everard Home, Efq.F. R, S."^ 



(Concluded from Vol. VI. Page 379.) 



Encouraged by the refult of this cafe, I was led to Another cafe 



perform a fimilar operation upon a perfon at a more advanced ^''^^ted in the 

 ' * * * fame manner, 



period or life. 



Margaret Dalton, 40 years of age, was admitted into St. 

 George's hofpital, on the 25th of December, 1801, on account 

 of a tumour, the fize of a pea, fituated on the right fide of/ 

 the tongue, near its edge. The hiflory of the cafe was as 

 follows. A fmall pimple appeared, and gradually increafed, 

 without pain ; the only inconvenience was, that it aflfeded 

 her fpeech, and, when bruifed by the teeth, bled freely. 



The operation was performed on the 1 llh of January, 1802, 

 in exadlly the fame manner as has been already defcribed. It 

 produced a confiderable degree of falivation, which was ex- 

 tremely troublefome, (much more fo than the pain the liga- 

 tures produced,) and continued till the flough came away. 

 The ligature neareft the root of the tongue feparated on the 

 6th day ; the other on the 7th ; and, in three days after the ^jth complete 

 feparation of the fecond ligature, the wound was completely fuccefs. 

 llvinned over. 



A 



