238 Scientific Intelligence. 



The following is the result of an analysis of a compact piece 

 of iron from No. 3, made by Mr. James B. Mackintosh, E. M. 

 of the School of Mines, New York City. 



Fe 87-93 



Ni 11-15 



Co 0-33 



P 0-36 



99-77 



Carbon, sulphur and other constituents were not determined. 

 The specific gravity of the entire mass No. 2 was taken on a 

 common steel-yard, and found to be 1 '66+. The figures may 

 be of interest, as showing the homogeneity of the mass, al- 

 though the method was not delicate. 



Troilite was observed in several places on the crust of No. 

 1, also traces of olivine, and perhaps schreibersite ? But as 

 yet the investigation of the mass is incomplete ; all facts re- 

 garding the included minerals will appear in a succeeding note 

 on this fall, together with some approximate data as to the 

 velocity at the moment of impact. 



I will add that this meteorite was brought to my notice by 

 Messrs. F. Alfred Reichardt & Co., and Dr. EL G. Torrey, who 

 have courteously given me information on the subject. 



SCIENTIFIC INTELLIGENCE. 



I. Physics. 



1. On " Transfer-resistance" in Electrolytic and Voltaic Cells,' 

 by G. Gore. (Abstract.) — The existence of this phenomenon has 

 been a matter of doubt ever since the year 1831, and the ques- 

 tion has been examined by many investigators. In the present 

 paper are described a series of methods by means of which its 

 reality has been determined. Other methods are given for 

 measuring the amounts of such " resistance," either collectively at 

 the two electrodes of an electrolytic cell, or separately at each 

 electrode. Modes of obviating the interference of polarization, 

 and of securing success in the measurements, are also described. 



The influence of various circumstances upon the phenomenon 

 were investigated, viz : strength and density of current ; total 

 resistance ; density of current and size of electrode ; composition 

 of the electrolyte ; strength of the same ; combined electrolytic 

 cells ; temperature ; and chemical corrosion. The relations of the 

 phenomenon to size of plate in voltaic cells, to the positive and 

 negative plates respectively, and to strength of current in those 

 cells, were also examined, and the results are o-iven. 



