JJg- CAHBONISEb TtJRI?. 



The energy of its aftion on gelaten and fltln Is Cerfainfy 

 inferior to that of the fird variety, into which however it may 

 eafily be converted by nitric acid. 



From the mode of its formation, there does not appear to 



be any evidence of its containing nitrogen like the firft and 



fecond varieties, and perhaps the abfence of nitrogen may be 



the caufe of its lefs powerful adlion. 



Experiments of In the courfe of the communications on this fubjed, Mr. 



Meflrs. Biggin, fJatchett notices the experiments on tannin by Mr. Biggin j 



Davy on unnln, the great contributions of M. Prouft to the elucidation of its 



noticed. nature and properties, and the very great extenfion of, and 



valuable additions to the fame, from the ingenious labours 



of Mr. Davy, particularly his difcox^ery of the fingular fa6t 



that terra japonica, or catechu, confifts principally of tannin. 



Medicine, arts, Tlie author alfo greatly recommends the farther invefliga- 



Scc. may derive tjon of the nature of the gums, refins, balfams, and gum- 



fxom farther in- ''^^"5, by every poffible method ; and is of opinion, that me- 



vcftigations of dicine, arts, and manufactures may derive many advantages 



^nis, re ns, ^^^^ j^^ ^^^ ^^^^ myfterrous procetfes of vegetation probabfy 



receive confiderable elucidation. 



VI. 



On carbonifed Turf. From a Report made to the PrefeSi of 

 Police (at Parh) &)i the Methods emploj/ed for reducmg it 

 to this Slate. By MM. C a l 1 1 a s and Co *. 



The ufcof turf ^ ^^ "^^ o^ ^^"^^ ^"'" donieftic fuel' is of a very ancient date : 



»6ry ancient. Some of the moll eminent men of fcience have pronounced that 



^letcrIou"cf- '^ ^°^^ "°'- pro'^'^ce any deleterious effects. Without citing the 



fcfti. examples of England (Ireland), Scotland, and Holland, where 



great quantities of it are confumed, we will confine ourfelves 



to the ufe made of it in France, in the (ci-devant) provinces of 



Flanders, Artois, and Picardy. 



Its ufe is now tolerated in Paris to relieve the fcarcity of 

 wood : the lime-burners, plaTler-balcers, • brick-makers, and 

 walhers, make great ufe of it both in the "city and its vicinity ; 

 and it has never been perceived that thofe who lived within 



* Sonini's Journal, JTom, II, p. 324» 



the 



