C. Schuchert — Notes on Arctic Paleozoic Fossils. 477 



1900. Charles Schuchert : On the Lower Silurian (Trenton) Fauna of 

 Baffin Land ; Proc. U. S. Nat. Mus., 22, pp. 143-177. 



1906. A. P. Low : Eeport on the Dominion Government Expedition to 

 Hudson Bay and the Arctic Islands on board the D. G. S. " Nep- 

 tune," 1903-1904. Appendix IV, report on fossils by Lambe and 

 Ami, pp. 322-336. 



1910. J. E. Bernier : Report on the Dominion of Canada Government 



Expedition to the Arctic Islands and Hudson Strait on board the 

 D. G. S. " Arctic." Report on the geology by J. G. McMillan, 

 pp. 382-478. Paleontological results, by Lambe, pp. 479-489. 



1911. R. S. Bassler : The early Paleozoic Bryozoa of the Baltic Provinces ; 



U. S. Nat. Mus., Bull.* 77, pp. 32-36. 



1912. Per Schei : Report of the Second Norwegian Arctic Expedition in 



the " Fram," 1898-1902. Out of the collections made on this 

 expedition have come the following papers : O. E. Meyer, Die 

 Entwicklung der arktischen Meere in palaozoischer Zeit ; Neues 

 Jahrb. f. Min., etc., Beilage-Bd., xxxi, 1912, pp. 184-219.— Die 

 Devonischen Brachiopoden von Ellesmereland ; Videns.-Selsk. 

 Kristiania, 1913, pp. 1-40. Olaf Holtedahl, On the fossil Faunas 

 from Per Schei's Series B in southwestern Ellesmereland, ibid., 

 1914, pp. 1-48. 



SCIENTIFIC INTELLIGENCE. 



I. Chemistry and Physics. 



1. The Radium- Uranium Ratio in Carnotites. — S. C. Llnd 

 and C. F. Whittemoee have made determinations of uranium 

 and radium in 21 samples of American carnotite ore, which has 

 become an important commercial source of radium. The samples 

 varied greatly in their contents of uranium oxide, ranging from 

 1*52 to 33*22 per cent of U 3 8 . The object of the investigation 

 was to study the uranium-radium ratio which was first shown by 

 Boltwood to be constant in many samples of uranium minerals, 

 and has since been studied by a number of investigators. Some 

 cases of lack of constancy have been found which have been 

 explained, either by supposing that the minerals are too young 

 to have reached equilibrium, or that radium has been leached out 

 in the case of porous minerals. In the investigation of carnotite 

 under consideration it was found that the radium-uranium ratio 

 was constant and like that of pitchblende in all large quantities 

 of well sampled ore, which comprised about one-half of the sam- 

 ples examined. Several small samples gave practically the same 

 ratio, but there were four small samples that gave a low propor- 

 tion of radium, ranging from 72*4 to 94*9 per cent, while four 

 others gave an excess of radium ranging from 107*8 to 137*8 per 

 cent of the normal amount, which is taken to be Ra/U=3*33X 

 10~ 7 . The explanation given by the authors for the variation of 

 the small samples is that there has been transposition of radium 



