224 



SCIENCE 



[N. S. Vol. XXVIII. No. 711 



agar, showed that the constituents of the mole- 

 cules of the alums separate from each other 

 readily hy diffusion at both 0° and 25°. 



The Constitution of Solutions of Iodine in Aque- 

 ous Potassium, Iodide: Chas. L. Paksons and 

 Geo. a. Peklet. 



Diffusion experiments with solutions of iodine 

 in aqueous potassium iodide, using membranes or 

 agar agar, show that the potassium iodide and 

 the iodine diffuse independently of each other in 

 both dilute and concentrated solutions. 

 The Inversion of Cane Sugar hy Inverta^e: C. S. 

 Hudson. 



It is shown that 'in dilute solutions the inver- 

 sion is a unimoleeular reaction, following accu- 

 rately the logarithmic formula. Tlie real rate 

 can not, however, be measured in a polarimeter 

 unless the solution is made alkaline before each 

 reading, as otherwise the apparent rate of in- 

 version is observed which differs from the real 

 rate by as much as 50 per cent. Henri, Arm- 

 strong and others who claim that the actions of 

 invertase and of other enzymes differ from the 

 usual types of catalysis, have measured the ap- 

 parent rate rather than the real rate. The in- 

 vestigation is being continued and a preliminary 

 notice of it may be found in the July number of 

 the Journal of the American Chemical Society. 

 Abstracts for the following papers have not 

 been received: 



Precipitation of Copper from Chloride Solutions 

 hy Means of Ferrous Chloride: Gustave Fee- 



NEKES. 



Precipitation of Copper from Chloride Solutions 

 by Means of Ferroiis Chloride and its Relation 

 to the Genesis of the Michigan Copper De- 

 posits: Gustave Fernekes. • 



Equilibrium in the System — Potassium Iodide, 

 Iodine and Ethyl Alcohol: Chas. L. Parsons 

 and Geo. A. Perlet. 



The Velocity of Reactions in Gases moving 

 through Heated Tubes and the Effect of 

 Catalysis: Irving Langmuir. 



An Automatic Regulator for Electric Currents: 

 Irving Langmuir. 



On the Mechanism of the Formation of Esters 

 from Alkyl Halides and Salts of Oi-ganic Acids: 

 S. F. Acree and F. M. Rogers. 



The Dissociation Pressures of Certain Oxides at 

 High Temperature: P. T. Warden. 



A Physico-chemical Study of the Phosphoric 

 Acids: G. A. Abbott. 



The Use of the Conductivity Method in Testing 

 'Nicotin Solutions and Tobacco Extracts: Har- 

 ris E. Sawyer. 



Studies in Electromotive Force: G. N. Lewis. 



The Reduction of Cadmium, by Mercury and the 

 E.M.F. of Cadmium Amalgams: G. A. Hulett 

 and K. E. DeLurt. 



Cadmium, Cadmium Sulfate and its Solutions: G. 



A. HutETT. 



Types of Electrolytes: J. Johnston. 



The Hydration of Ions: E. W. Washburn. 



Negative Viscosity: Frederick H. Getman. 



Latent and Specific Heats of Some Fused Salts: 

 H. T. Kalmus. 



The Behavior of Colloidal Metals with Immiscible 

 Solvents: W. Lash Miller. 



Solutions of Metals in Liquid Ammonia: C. A. 

 Kraus. 



Electrolytic Reduction of Permanganate Solu- 

 tions: J. W. TURRENTINE. 



Mercury Cathodes in Nitric Add Solutions: J. A. 

 Wilkinson. 



On Vapor Pressures: 0. F. Tower. 



On the Electrolytic Oxidation of Hydrazine Sul- 

 fate: 3. W. TURRENTINE. 



Action of Ferric Sulfate on Copper: C. G. 



SCHLUEDERBEEG. 



Experiments with Halogen Carriers: C. G. 



Schluederbebg. 

 The Source of the Thorium Disintegration 



Products Present in the Atmosphere: Beetkam 



B. BOLTWOOD. 



The Presence of Lead in Autunite and Other 

 ' Secondary Uranium Minerals : Bertram B. 



BoLTWOOD. 



The Capillarity of Mercury in the Presence of 

 Vapors: Morris Loeb and Stephen R. Moeet. 



Determination of the Vapor Tension of Solutions 

 by Means of the Morley-Brush Gauge: O. F. 



TOWEE. B. E. CUEEY, 



Press Secretary 

 Transmitted by Peofessor Chas. L. Paesons, 

 Secretary. 

 New Hampshiee College 



