which can be scraped off. This portion is what, I imagine* 

 wa* uiitpd w ith carbonic acid, and is deposited on the glasses, 

 on tlie sides and bottom of the baths, in the state of ochre. 



— <?d. — Pyrites oH. — Ii forms pvritical incrustations about the reservoirs and 

 cha nels of the baths ; in these the iron is in its metallic state 

 nnhM with sulphur, as they are vitriohzable on exposure to 



--nd. — Blark air and moisture. 3d. — It is deposited in the sand of the bath 



saniioimet - -^^ j^i.^^^.^ particles, which are attracted by the magnet. Som« 

 of thee particles appeared of a crystalline form, but not suffi- 

 cieiitly bo to allow me to determine their figure. 



From the above experiments, which were conducted with 

 much care, it appears that iron exists in the Bath waters in its 

 metallic state, or nea,ily approaching it. Jt appears alsoj, 

 that the small portion of iron which is united with car- 

 bonic acid, and which is deposited in the baths and in the 



Th« Bath wa- glasses used for drinking the waters, in the form of yellow cai:- 



ters coiitam bonatfe, oir oxide, is the only portion thai has been hitherto es- 



tnore iron than ' •' '^ 



lias bithtrto timated as the quantity of iron contained in the waters ; which 



been supposed, quantity is very inadequate to account for the effects these 



waters produce on the human constitution. 



I am, Sir, 



Ypurs, very respectfully, 



Batlt^ July ^a, 1805. G. S. GIBBES, 



VI. 



Jjetier of Inquiry respecting the Cause why Men cfinnot sivinv 

 mtliQut previous c^ducation as liiell as Brutes. From a Cor" 

 respundentf R. B. With various Observations by the Edii 

 tor. 



To Mr. NICHOLSON, 

 SIR, 



HemarkaMe JL T has always appeared to me a remarkable fact, that every 

 fact that brutes ^jjjjj^^j ^jj^^^ thrown into deep water should swim without dif- 

 Swim naturally, , , , , , 



ar^d men do ficuity ; but that the human species, if by any accident put 



*o*- into a like situation, is sure to be' drowned, unless the indi- 



vidual has been previously educated to keep himself afloat. 



I have 



