1816.) during the Year 1815. AS 
they contain do not hold good. The following are the results which 
Berzelius obtained :— 
re re TT ETT TEL AVA LT bn da ee 
Substances. Oxygen. 
SO 
Citricacid ..........| 54°831 
Tartaric acid .....:..| 60°213 
Oxalicacid ..........| 66°534 
Succinic acid ........| 47°888 
Keetic acid .......... 46°82 
MGMING CIOs. <. alec se on 38 36 
Saclactic acid ........ 61°465 
Benzoic acid ........ 20°43 
Tannin (from nutgails) | 44°654 
Common sugar..... PH he 
Sugar of milk .......- 53°359 
Gium-aravic) ¢ ..<s,..<:00. 51°306 
Potatoe starch........ A49°455 
COMPOSITION. 
Per Cent, In Atoms, 
Carbon, | Hydrogen,| Oxy. |Carbon.|Hydrogen, 
41°369 3°800 1 1 1 
35°980 | 3:80? 5 4 5 
33°222 0244 18 12 1 
47°600 4-512 3 4 4 
46°83 6°35 3 4 6 
56°64 5:00 3 6 6 
33°430 5105 8 6 10 
q4Al 5:16 1 5 3 
51-160 4°186 4 6 6 
41°48 7:05 10 12 21 
39°474 | 7167 1 1 2 
41-906 6°788 12 13 24 
43°A81 7064 6 7 13 
I conceive that I have given satisfactory proofs (Annals of Philo- 
sophy, vol. v. p. 187), that oxalic acid contains more hydrogen than 
-Berzelius obtained in his analysis, and that it is in reality com- 
posed of 
Oxygen.. 3 atoms | Carbon... 2 atoms | Hydrogen .. 1 atom 
I think it may be easily proved in the same way that the true 
composition of the other. vegetable acids analyzed by Berzelius is as 
Pee ia) eee 
‘ follows :-— 
COMPOSITION. 
Per Cent. In Atoms. 
Substances. Oxygen.|Carbon. | Hydrogen.| Oxy. Carbon. Hydrogen. 
SATII |) sricisicn wine 55°036 | 41-332 | 3:°632 2 2 1 
Tartaric acid .....-.. 59-524 | 35°762 | 4714 5 4 3 
Oxalic acid ........-+ 64°739 | 32°413 | 2°848 = a g 1 
Succinic acid .....--. | 47:923 | 47°859 4-218 F | 4 2 
Acetic acid ..,...---- 46875 | 46°938 | 6:187 3 A 3 
Gallicacid ......-.-- | 38-098 | 56892 | 5-010 1 2 1 
Saclacticacid ........ 60°763 84225 5 Je canal chee yee ie iy 
As for Benzoic acid I suspect Berzclius has committed some 
mistake in the analysis of it; for its composition as derived from 
the benzoate of lezd does not agree in the least-with the statement 
of this most ingenious chemist. [ do not at present notice the 
analysis of the five last substances in Berzelius’s table, because the 
subject is attended with certain difficulties which would require 
more room to explain them than [ can afford at present. 
Saussure has given us the analysis of several vegetable substances. 
