26 



SCIENCE. 



[N. S. Vol. II. No. 27. 



concentration is effected by making the ore 

 magnetic by roasting in a suitable furnace 

 in contact with producer gas, then after 

 crushing to small size passing it over a mag- 

 netic separator, when the silica is thrown 

 off and the iron ore remains to fall into a 

 bin. The experiments have been carried 

 far enough to demonstrate the fact that 

 concentration may be carried out which 

 will make available the stratum of ore 

 hitherto thrown aside as too high in silica 

 for profitable working. The carrying out 

 of this process on a commercial scale would 

 mean a great deal for the Birmingham dis- 

 trict. 



The subject set for discussion at this 

 meeting was the utilization of the by-pro- 

 ducts of the coking ovens, and on this Mr. 

 A. J. Montgomery read a paper of much 

 interest. The next meeting of the Society 

 will be held in the autumn. 



Eugene A. Smith, 



Secretary. 



ST. LOUIS ACADEMY OF SCIENCE. 



The Academy held its regular meeting on 

 June 17th, with President Green in the chair 

 and 25 members and visitors present. 



Dr. C. E. Sanger spoke of the Chemistry 

 of Photography, dividing his discourse into 

 the following headings: (1) The Forma- 

 tion of the Latent Image. (2) The De- 

 velopment of the Latent Image. (3) The 

 Fixation of the Developed Image. (4) The 

 Printing of the Positive. (5) The Toning 

 of the Positive. 



Adjourned until the third Monday in Oc- 

 tober. A. W. Douglas, 



Recording Secretary. 



SCIENTIFIC JOURNALS. 

 THE AMERICAN JOURNAL OF SCIENCE. 



The July number of the American Journal 

 of Science commences the fiftieth and clos- 

 ing volume of the third series; it is the one 

 hundred and fiftieth volume since the Jour- 



nal was established in 1818. The opening 

 article is by Frank Leverett, on the Corre- 

 lation of ISTew York moraines with raised 

 beachs of Lake Erie. The investigation 

 here detailed is in continuation of the work 

 earlier done by the same author (the re- 

 sults published in 1892) in tracing the con- 

 nection between the raised beaches of the 

 western portion of the Erie basin and cer- 

 tain moraines in Ohio. It is a department 

 in which G. K. Gilbert had also made ex- 

 tensive investigations previous to this time,, 

 notably in 1886. The names given to the 

 successive beaches are those suggested by 

 -Mr. Gilbert, viz., the upper or Sheridan 

 Beach, traced by Gilbert from Cleveland 

 eastward to Sheridan, N. Y., which may be 

 a continuation of the western Belmore 

 Beach and the lower Crittenden Beach,- 

 especially investigated to the eastward near 

 Hamburg. A map is given by Leverett, of 

 the region under discussion, showing the 

 position of the beaches and the moraines 

 and other related features exhaustively 

 treated in this article. The author reaches 

 some important conclusions, which, how- 

 ever, hardlj' admit of brief statement; one 

 point made relates to the successive outlets 

 of the lake during the glacial times. A 

 paper by H. L. Wells describes, as a con- 

 tinuation of former work in a similar sub- 

 ject, two remarkable chemical compounds 

 containing lead and extra iodine. These 

 are Johnson's salt for which the formula 

 5Pb (CH3 C0„)2 .3KI .61 or perhaps 5Pb 

 (CH3 C0„)2 .3KI3 is deduced and Groger's 

 salt with the formula Pblj.PbO.SI.H^O. 



Two papers on analytical chemistry come 

 from the laboratory of F. A. Gooch, the 

 first embodj'ing the results of work by him- 

 self and Charlotte Fairbanks in the estima- 

 tion of the halogens in mixed silver salts,^ 

 and the second with C. F. demons on the 

 determination of selenious acid by potas- 

 sium permanganate. S. F. Peckham, in a 

 paper upon the Pitch lake of Trinidad, de- 



