76 PROCEEDINGS OF THE PRINCETON MEETING 



are not uncommon. The thickness, the dip. the strilie, and the content of the 

 oolitic stratum is variable throughout the lOG miles of its linear extent. The 

 microscopic examination shows, in some cases, oolites of a uniform size, while 

 in others they are in all stages of development. A few oolites possess primary 

 nuclei, many none at all. the remainder having secondaiy nuclei. In the cherty 

 areas the calcareous oolites have been wholly or partially replaced by silica. 



Presented in abstract without notes. 



Discussion 



Dr. George P. Merrill asked whether the calcite in the oolites might not be 

 reciTstallized in place and not have been introduced in a secondary manner. 



Doctor Reeds replied that he considered it quite probable. 



Prof. O. C. Farrixgton asked whether oolites are of organic or inorganic 

 origin. 



Doctor Reeds answered that he considered them of inorganic origin. 



TEMISKAMITE, A NEW NICKEL ARSENIDE FROM ONTARIO 

 BY T. L, WALKEB 



(Abstract) 



This mineral occurs in calcite veins carrying niccolite and native bismuth. 

 Temiskamite resembles niccolite, but is pale lilac in color. No crystallized 

 material has been obsen'ed, the mineral being radiating fibrous in botryordal 

 forms. 



Luster metallic ; specific gravity, 7.901 ; hardness, 5.5 ; fusibility, 2. Freshly 

 broken surfaces readily tarnish to colors resembling bomite. 



A chemical analysis shows the following result: 



Nickel 49.07 per cent -4- 58.7 = .8359 



Cobalt 1.73 per cent ^59 =.0293 > -^^^ 



75 = .6179 1 

 32 = .0321 I 



Arsenic 46 . 34 per cent . .„ _ ^ . ^^ 



Sulphur 1 .03 per cent "" ^""^ 



Bismuth 55 per cent 



Total 98. 72 per cent 



Formula (Ni. €0)4 (As. 8)3 — or Nii ASg. 



Bismuth content is thought to result from inclusion of native bismuth. 



Presented in abstract without notes. 



