1004 



EXPERIMENT STATION RECORD. 



being deducted from the amount found in the first determination. The 

 result multiplied by the factor 3.-120 gave the amount of fnrfurol. 



In 7 analyses of furfurol by this method the percentages found varied 

 from 99.4 to 102.4, the average being 100.5 per cent. 



Contributions on the chemistry of tobacco: II. The determi- 

 nation of the nonvolatile organic acids in tobacco, R. KiSSLiNG 

 (Chem. Ztg., 23 (1899), No. 1, pp. 2-1). — This deals with the method and 

 results of the determination of oxalic, citric, and malic acids in differ- 

 ent kinds of tobacco. The results obtained are given below: 



Oxalic, citric, and malic acids in different kinds of tobacco. 



Oxalic acid 

 Citric acid . 



Malic arid . 



Percent. 



2.08 

 5. 32 

 :: 19 



Brazilian. Sumatra, 



Percent. 

 3.05 

 5. 09 

 3.56 



Per cent. 

 2.50 

 6.40 

 4. 95 



Virginia. 



Seed leaf. I't'alzer 



Percent. 

 0. 00 

 8.73 

 4.72 



Per cent. 



1.74 



5. 'Jo 



10.40 



Mace- 

 donia. 



Bosnia. 



Percent. 



3.72 

 0.55 

 3.78 



Percent. 

 2.29- 

 1.63 



8.08 



The averages for these acids are given as follows: Oxalic 2.28, citric 

 5.75, and malic 5.65 per cent. 



Dictionary of industrial chemistry, A. M. Villon and P. Guiciiard (lHctionaire 

 de chimie industrielle. Paris: B. Tignol, 1899, Vol. 2, No. 19). 



A treatise on quantitative chemical analysis by electrolysis, J. Riban ( Trail v 

 d'ana lyse chi in iq ne q n a n I i tati ce par electrolyse. Pa ris : Masson et Cie. , 1S99, pp. VI -4- 304, 

 figs. 96). 



Methods of analysis adopted by the experiment stations of Belgium and 

 Holland, F. Hollemann (Landw. Vers. Stat., 51 (1899), No. 4-5, pp. 357-365) .—The, 

 methods have been previously noted (E. S. R., 10, p. 304). 



Questions which arise in the analysis of potashes, Lacombe (Bnl. Assoc, ('him. 

 Sucr. et Distill., 16 (1899), No. 9, pp. 894-907). 



On the unreliability of Bottcher's method for determining citrate-soluble 

 phosphoric acidin Thomas slag, M. Passon (Ztschr. Angew. Chem., 1899, No. l,p. 3). — 

 The author found this method (E. S. R., 10, p. 310) to give results one-half per cent 

 higher than those obtained with the molybdic method. This error is ascribed to the 

 presence of silica in the precipitate. 



On the insoluble residue from the treatment of Thomas slag with Wagner's 

 solution, M. Passon (Ztschr. Angew. Chem., 1S9S, No. 2l,pp.4S9, 490). — The residue, 

 carefully washed with water, alcohol, and ether was submitted to analysis. It was 

 found that the phosphoric acid was still dissolved to a considerable extent by citrate 

 solutions. The phosphoric acid of the tine meal was more soluble than that of the 

 coarse slag, but when the coarse portion was ground line, the phosphoric acid was 

 as soluble as in the unsifted meal. 



On the determination of phosphorus and sulphur in plants and in their ashes, 

 M. Berthelot (Compt. Bend. Acad. Sci. Parix, US (1S!>9), No. 1, pp. 17-23; abs. in Rev. 

 Sci. [Paris], 4. set-., 11 (1S99), No. 2, p. 51). — The ordinary methods of determining 

 these substances, by cautious incineration or prolonged digestion in concentrated 

 nitric acid, are stated to be very inaccurate. A much more exact method was found 

 to be incineration in oxygon in a calorimeter, the gases produced being conducted 

 through a loug column of sodium carbonate heated to low redness to prevent loss by 

 volatilization. 



On the presence and determination of chlorin in plants, M. Berthelot (Compt. 

 Bend. Acad. Sci. Paris, 128 (1S99), No. 1, pp. 23-26).— The method of determining 

 phosphorus and sulphur described above was used successfully in the determination 

 of chlorin. 



