36 Letter finm Dr. Thornton on the Coiv-Pox. 



oxide and chiv are more Iniusiblc than those formed by 

 lime. The particles of chiy and silcx, therefore, being the 

 last to. enter mto fusion, m'K^l be the last to exert their affi- 

 nities upon the carbon. 'I'his being unacted upon, except 

 by tl)e oxide, rendilv unites first to carry oft" the oxygen, 

 and next to impregnate the iron with carbonaceous matter. 



If this takes phice at an early stage of the operation, it is 

 evident tliat the metallic result may be formed in conse- 

 quence of the entire combination of the carbon before ths 

 earths have entered into fusion. 



The quantity of carbon which the oxide of the calcareous 

 compound takes up before any metal is allowed to fall, re- 

 mains still luicxplaincd, and appears a curious and very im- 

 portant fact, which cannot be solved by the last hypothesis. 

 The presei\ce of lime seems to prevent the inunediate action 

 of the metallic particles upon the carbon, but directs the 

 whole force of the latter to the removal of the oxygen. By 

 this means, however, it secures in the cud a richer and 

 more plentiful harvest of metal from ores similarly com- 

 pounded. 



'Jlie progressive stages of metallization are marked, in 

 many instances, with a greater proportion of produce than 

 in experiments witii argillaceous and siliceous ores. 

 In the 1st class, the increase of t!ie produce in iron, see 



Exps. I [ and III, was 1 7 grs. for 8i carbon 



Inthe Cd cla?s, .IV and V, — ^1 8J. 



In the 3d class, 



or calcareous, V and V^T, — 60 -2^2 



[To be continued.] 



V. Letter J'lom Dr. Thornton to Mr. Tu.uoch on the 

 . One- Pox; ■ivhii. an Jccouat of the Cases in FuUeood's 

 Rents. 



No. I, Hind-street, Manchester-sijuare, 

 UKAR Sfi!, October 15, 1804. 



J. hi: subject <jf the cow-pock is of such genera/ interest, 

 that 1 shall delay my fifth letter to Mr. Arthur Aikin, to 

 saya few words on the late eases of stipposed small-pox after 

 the tow-pock hioeulation so generally known in this me- 

 tropolis. 



Dr. I.ett^o^n in a letter to me on the receipt of my work 

 entitled " Facts decisive in favour of the Cow-pock," which 

 I presented to him, says, *' that after what has been written 

 by me and others on vaeeinalion, the practitioner who now 



inoculates 



