478 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.59. 



would seem their presence should have been made known by the 

 analysis (p. 475). 2 This, together with an even greater abundance of 

 the isotropic maskelynite, constitutes the most interesting feature 

 of the stone. The pyroxenic constituent is almost completely color- 

 less in the section and is evidently a normal enstatite. The metal, 

 sulphide, and other opaque constituents require no special mention. 



* Doctor Schoch's attention having been called to this discrepancy, he has, since the above was in 

 type, made further investigations and reported 0.51 Pj0 5 . See p. 475 of Udden's paper. 



