274 



SCIENCE 



[N. S. Vol. XXXI. No. 790 



terminations can be obtained only when the meth- 

 ods and instruments are identical with those 

 used in the standardization experiments, and the 

 amount of emanation is also approximately the 

 same. 



On the Oxalates of Hydrazine : J. W. Tuebentine. 



Two oxalates of hydrazine have been prepared, 

 the neutral monoxalate ( N^H, ) j.HjC^O.,, and the 

 acid dioxalate, N2H4.H2C0O4. They crystallize from 

 water in colorless plates. 



The monoxalate is very soluble in water, while 

 the dioxalate is only sparingly soluble in that sol- 

 vent when cold. Both are insoluble in alcohol and 

 ether. These salts do not exhibit definite melting 

 points. When heated, intromolecular oxidation oc- 

 curs with the formation— among other products — 

 in the case of the monoxalate, of hydrazine hydrate, 

 hydrocyanic acid or cyanogen, and a white crys- 

 talline sublimate which, from tests, appears to 

 be a salt of hydrazine with an unidentified, car- 

 bonaceous acid, and in the case of the dioxalate, 

 of ammonia, a cyanide and a white sublimate of 

 an ammonium salt with some carbonaceous acid. 

 A new method of analysis is described, especially 

 applicable to the analysis of salts of hydrazine 

 with easily oxidizable acids, whereby, with stand- 

 ard potassium permanganate solution, both the 

 acid and the basic radicals of the oxalates are 

 determined simultaneously. 



Notes on the Preparation of Ohromyl-Compounds : 



Haeey Shiplet Fet. 



The paper is a rgsumS of attempts to prepare 

 the unknown compounds chromyl bromide and 

 chromyl iodide. While only partially successful 

 in this respect, certain noteworthy results were 

 obtained, namely: a new reaction for the prepara- 

 tion of chromyl chloride; a reaction for the de- 

 tection of minute traces of chromyl chloride 

 (0.00001 gm. per 1 c.c. of solvent) depending 

 upon the formation and color of chromyl bromide; 

 the preparation and identification of two new 

 compoimds — chromyl acetate and anhydrous 

 chromic acetate. 



The Sohihility of Gold in Nitric Acid: Feedeeic 



P. Dewey. 



Contrary to the general statement that gold is 

 not soluble in any single acid, there are various 

 statements in assay literature that gold may go 

 into solution in the nitric acid during parting. 

 After reviewing previous work upon the subject, 

 the results of which are not, for. various reasons, 

 conclusive, this paper describes some tests upon 

 the nitric acid after use for parting in gold bul- 



lion assays which gave most conclusive evidence 

 that the acid did really carry gold. 



These tests are followed by more elaborate ones 

 upon larger amounts of gold and with increasing 

 precautions. On two occasions 6 to 700' c.c. of 

 solution were obtained, carrying more than 

 180 mg. of gold per liter. 



A final crucial test, carried out with the utmost 

 care, entirely in platinum, on about 30 grams of 

 finely divided gold, by boiling it for two hours 

 in previously boiled nitric acid of 1.42 sp. gr., 

 yielded a solution which, after filtering, contained 

 gold at the rate of over 660 mg. per liter. 



It is shown to be very easy to dissolve finely 

 divided gold in boiling nitric acid of 1.42 sp. gr. 



On the Chief Determining Factor in the Toxicity 

 of the Metal Ions: L. L. Woodkiiff and H. H. 



BUNZEL. 



Discussion of a series of experiments to deter- 

 mine the relative toxicity of various salts toward 

 protoplasm. Results show a parallelism between 

 the smallest fatal concentration of the various 

 ions and their " ionic potential." 



Metallic Titanium: Matthew A. Huntee. 



The only successful preparation of pure 

 titanium is that used by Nilson and Peterson by 

 the reduction of TiCl^ with sodium. Titanium so 

 prepared does not differ in outward appearance 

 from polished steel. It is however hard and 

 brittle when cold. If however it be raised to a 

 low red heat, it may be forged like red-hot iron. 

 If the temperature be carried much above a low 

 red the metal oxidizes superficially in air. Homo- 

 geneous rods 6 inches in length have been pre- 

 pared and it is hoped to be able to prepare wire 

 from them. Tlie metal may be easily polished on 

 an ordinary grindstone. It is too hard to be 

 sawed by a hack saw but may be filed to shape 

 by an ordinary file. 



The specific gravity of the melted metal was 

 found to be 4.51 at 18° C. The specific gravity 

 of the forged material did not differ sensibly from 

 this value. The melting point of the material is 

 between 1,800 and 1.850° C. Analysis of the 

 molten beads shows that the material is 100 per 

 cent, titanium, containing no iron, sodium or oxy- 

 gen as impurities. 



Some New Double Arsenates: L. J. Cubtman. 



If to a hot ferric chloride solution, strongly 

 acid with hydrochloric acid, diammonium arsenate 

 solution be added to incipient precipitation, and 

 the mixture heated, there forms a white finely 

 divided precipitate which analysis showed to be 



