June 26, 1914] 



SCIENCE 



955 



hard water in the making of jellies reduces the 

 pectin contact. Experiments in this line are being 

 conducted. A bibliography of recent work is ap- 

 pended. 



A Bapid Method for Commercial Analysis for Marls 

 and Limestones: O. B. Winter. 

 The commercial value of marls and limestones 

 used for agricultural purposes depends largely 

 upon their content of calcium and magnesium in 

 the form of carbonates. Two methods are given 

 for estimating lime — one, precipitating the cal- 

 cium oxalate in the presence of oxalic acid, and 

 the other, in the presence of hydrochloric acid. 

 The carbon dioxide is determined by treating the 

 sample with a small volume of hydrochloric acid 

 and measuring the gas evolved. Results show that 

 this method for carbon dioxide compares favor- 

 ably with several other methods when certain pre- 

 cautions are used. 



The magnesium is determined by calculating the 

 amount necessary to combine with the carbon di- 

 oxide not taken up by the lime. 

 A Method for the Estimation of Calcium, Stron- 

 tium and Magnesium in the Presence of Phos- 

 phoric Acid and Iron: O. B. Winter. 

 Calcium and strontium are precipitated as the 

 oxalates in a dilute hydrochloric acid solution. 

 The oxalates are burned to the oxides, weighed 

 and then nitrated and the nitrates weighed. The 

 amounts of each (calcium and strontium) axe de- 

 termined as follows: (1) By separating the ni- 

 trates with absolute alcohol and ether. (2) By 

 calculation from the amounts of oxides and ni- 

 trates. The magnesium is determined as mag- 

 nesium pyrophosphate in the filtrate from the ox- 

 alates, by removing the ammonium salts and silica, 

 and keeping the iron in solution by means of 

 sodium acetate. 

 The Chemistry of the Decomposition of Peat and 



Much: C. S. Robinson. 

 Some Pot Experiments with Mixtures with Teat 

 and Manure in Connection with Various Fer- 

 tilizers: C. S. EOBINSON. 



BIOLOGICAL CHEMISTRY DIVISION 



Carl L. Alsberg, chairman 

 I. K. Phelps, secretary 

 Coagulation of Albumen hy Electrolytes: Wilder 

 D. Bancroft. 



Colloidal Swelling and Hydrogen Ion Concentra- 

 tion: L. J. Henderson, W. W. Palmer and L. 

 H. Newbuegh. 



The Functions of Ammonium and Phosphoric Acid 

 in the Regulatory Excretion of Acid: L. J. 

 Henderson and W. W. Palmer. 



Partition of the Nitrogen of Plant, Yeast and 



Meat Extracts: F. C. Cook. 



There is great variation in the precipitating 

 power of the different reagents compared. Phos- 

 photungstic acid precipitated the highest, tannin 

 salt reagent the next highest and acid-alcohol the 

 lowest percentage of the nitrogen of the seven 

 plant, five meat and one yeast extracts examined. 

 The formol titrated method gave lower results for 

 amino nitrogen than the Van Slyke method. All 

 of the methods showed a larger percentage of the 

 nitrogen present in a more completely hydrolyzed 

 state in the plant than in the other extracts. No 

 kreatinin, and very little purin nitrogen was found 

 in the plant extracts. The yeast extract was high 

 in purin nitrogen, but contained no kreatin or 

 kreatinin. The nitrogen of the plant extracts was 

 found in the filtrate from the acid-alcohol reagent. 

 Twenty-five per cent, of the nitrogen of the other 

 extracts was precipitated by this reagent. The 

 plant extracts showed more ammonia by the Folin 

 method than the other extracts. 



Comparison of the Various Methods for the Quan- 

 titative Determination of Sugar in Blood: Max 

 Kahn. (By title.) 



Clinical Studies of the Busso Test: Max Kahn. 

 (By title.) 



Urinary Catala-se in Health and Disease: Mas 

 Kahn and C. J. Brim. (By title.) 



On the Presence of Oleic Add in Gastric Contents 

 of Patients Suffering with Gastric Carcinoma: 

 Max Kahn and J. Subkis. (By title.) 



The Lipins of Diseased Human Livers: J. Eosen- 

 BLOOM. (By title.) 



The Potassium Content of Cerebrospinal Fluid in 

 Various Diseases: J. Eosenbloom and V. L. 

 Andrews. (By title.) 



A Standard in the Determination of Ammonia hy 

 Nesslerizing with the Dubosc Calorimeter: A. E. 

 Rose and Katheeine E. Coleman. (By title.) 



Nephelomeiry in the Study of Nucleases: P. A. 



KOBER. 



A Soluble Polysaccharide in Lower Fungi: A. W. 

 Dox. 



The Chemical Dynamics of Living Protoplasm: W. 



J. "V. OSTERHOUT. 



