Steam-Engines. — Chemistry. 



147 



tellites for the montli of January, he finds the position of almost 

 all of them erroneous. Tiiis assertion is couched in terms of so 

 broad a latitude, tliat it requires no other answer than that (I 

 sincer' Iv believe) it proceeds entirely from his unskilfulness and 

 his inattention to Mr. Vince's duections relative to the computa- 

 tion of the confiiiurations in the months of January and February 

 in years called Bissextile. 



I am, sir, your obedient servant, 

 To Mr. Tilloch. Manchestriensis. 



STEAM ENGIXES IN CORNWALL. 



From Messrs. Le^^ns' Report for January ISIS, it appears 

 that during that montii the following was<the work performed by 

 the engines reported, with each bushel of coals. 



Fiiiiiids of Water lifted 

 i foot /lig/i witli each husliei. 

 22 common engines averaged 22,188,313 

 Woolf's at Wheal Vor . . 30,834,438 

 Ditto Wb. Abraham .. 41,847,961 



Ditto ditto .. .. 27,942,875 



Ditto Wheal Unity .. 31,900,613 



Dalconth engine .. .. 42,622,141 

 Wheal Abraham ditto .. 32,239,445 

 United Mines engine .. 36,396,841 



Treskirby ditto . . . . 38,733,954 



Wheal Chance ditto . . 28,496,996 



Load per square 

 incli in cylinder. 



various. 



17-2 lib. 



16-8 

 4-76 



131 



11-2 



10-9 



16-9 



10-6 

 8-9 



OXALIC ACID, FERMENTATION, CELESTINE, &C. 



Extract of a Letter from Professor Wurzer, of Marhirg, to 

 Professor Van Mons. 



I have lately found the oxide of iron and a trace of the oxide 

 of manganese in a human calculus. I have met with both the 

 same oxides in pulmonary concretions, which a patient afflicted 

 with pneumonia, and of which he was cured, had ejected. 



Our friend M. Dobereiner has found that the oxalic acid as 

 well crvst.allized as effloresced (this last combined with a propor- 

 tion of water); so (hat the oxalates even to that of lime are decom- 

 posed by concentrated sulphuric acid, with which they bear a great 

 affinity. The oxalic acid resolves itself into equal volumes of car- 

 bonic acid and gaseous oxide of carbon. As these proportions 

 of volumes correspond exactly with those of the weights furnished 

 by analysis of the acid, the oxalic acid may be considered as car- 

 bonate of oxide of carbon — at all times as a comijination which in 

 the free acid is maintained in composition by water, and in saline 

 coinbinationa by oxide bases, and which of course ceases to exist 



K 2 the 



