July 3, 1914] 



SCIENCE 



36 



using an alcoholic solution of iodine, and adding 

 at the same time an alcoholic solution of mercuric 

 chloride, to take up the liberated hydriodic acid. 

 One gram of antipyrine^ 1.351 grams of iodine. 

 The authors find that as effective a method con- 

 sists in the substitution of an ordinary N/10 

 iodine solution for the alcoholic iodine solution, 

 titrating in the presence of alcohol, and adding 

 sufficient alcoholic mercuric chloride to combine 

 with the hydriodic acid liberated and in addition 

 enough to combine with the potassium iodide in 

 the N/IO iodine solution. The results are accu- 

 rate and the endpoint is distinct. 

 Further Notes on Lloyd's Beagent for Alkaloids: 



SiGMUND WALDBOTT. 



In precipitating quinine from aqueous solutions 

 of quinine bisulphate by means of Lloyd's reag- 

 ent,2 the filtrate upon evaporation yields crystals 

 of calcium sulphate, due to the calcium contents of 

 the reagent. When the CaO is completely re- 

 moved by hydrochloric acid, the modified acid-free 

 reagent, upon precipitating quinine from quinine 

 bisulphate, yields free sulphuric acid in the fil- 

 trate. This demonstrates that the affinity of the 

 reagent for alkaloid is strong enough to tear 

 asunder the quinine bisulphate molecule. 

 Estimation of PJienaoetin and Acetanilide in Ad- 

 mixture: W. O. Emery. 

 Estimation of Antipyrin: W. O. Emery and S. 



Palkin. 

 Estimation of Caffeine and Antipyrin in Admix- 

 ture: W. O. Emery and S. Palkin. 

 Estimation of Plienaoetin and Salol in Admix- 

 ture: W. O. Emery, C. C. LePetbe and G-. C. 

 Spencer. 

 A Method for the Estimation of Podophyllum 



Sesin: "W. M. Jenkins. 

 Commercial Papain and its Testing: H. M. 



Adams. 

 Some Observations on the Leach Test for Couma- 



rin: William G. Gaessler. 

 Digitalis Ash: Charles T. P. Fennel. 



The recognized importance of mineral constitu- 

 ents in plants, the elements of plant development 

 — ^their equal importance to plant life — classifica- 

 tion as air and soil groups — ^products of plant life 

 — products of physiological processes not in the 

 ash — foundation substances of the soil — the needs 

 of proper soil to fit the plant for specific pur- 

 poses — ^medicinal plants — history of the method of 

 use — juices direct — watery extracts, alcoholic ex- 

 2 Cf. Jour. Amer. Chem. Soc, June, 1913. 



tracts — isolation of so-called active constituents — 

 variations in therapeutic action — the preexist- 

 ence and the generation of active constituents by 

 manipulation of processes of extraction — digitalis 

 and other plants — the ash — constituents — peculi- 

 arities — elementary decay — eka silicon — radioac- 

 tive matter in rocks and soils — effect on plant 

 life — experimentally. 



The Estimation of Morphine: H. M. Gordin. 

 The Estimation and VariaJiility of Alcohol in 



Galenicals: L. P. Kebler. 

 Mesults of the Examination of Some Medical 



Agents in the District of Columiia: L. P. 



KJEBLER. 



Extraction of Morphine from Aqueous Solution: 

 h. buchbinder. 



division op industrial chemists and chemical 



engineers 



Geo. p. Adamson, Chairman 



S. H. Salisbury, Jr., Secretary 



Volumetric Determination of Sulphur in Iron Ore: 



L. Selmi. 



The method is based on the ignition of the ore 

 in a current of hydrogen and in presence of zinc 

 (and animal charcoal if sulphates of lime and 

 barium are present). The reduction is prolonged 

 for about twenty minutes and the heat discontin- 

 ued and the furnace cooled rapidly at room tem- 

 perature while the hydrogen is kept going through 

 the furnace. When room temperature is attained 

 the reduced ore is transferred to an evolution flask 

 and the H2S evolved as in the case of iron and 

 steel. Accurate results have been obtained in less 

 than one hour, and this method is especially 

 adapted for the determination of low sulphur in 

 iron ores. The apparatus required is a fused silica 

 tube, heated either by electricity or gas, a Kipp 

 hydrogen generator and three gas washing bottles. 

 On a number of determinations by this method I 

 obtained the following sulphur results on the 

 Bureau of Standards magnetite ore (standard 

 .025 per cent.) : .025, .026, .025, .024, .027, .025. 

 Pitot Tubes for the Measurement of Gas Veloci- 

 ties: Andrew M. Faiklie. 



Numerous instances are cited in which some 

 method of accurately measuring gas velocities is 

 needed. Errors appearing in recent publications 

 on this subject are corrected. As a result of re- 

 cent work, a type of Pitot tube is indicated, which 

 chemical engineers may select and use, under cer- 

 tain conditions, with confidence. Features requir- 

 ing further investigation are pointed out. 



