404 Scientific Intelligence. 





SiOo 



AloO, 



Fe 2 3 



FeO 



MgO 



CaO 



Na 2 



K 2 



H 2 4 



I 



63 60 



15-84 



1-45 



2-72 



1-14 



3-03 



4-33 



326 



3-88 



II 



46-78 



21-22 



463 



6-17 



4-30 



12-07 



1-40 



0-64 



094 



III 



43-98 



1769 



5-97 



6-68 



7-83 



11-71 



1-34 



0-64 



1'77 



IV 



60-96 



16-62 



3-87 



261 



0-95 



6-35 



3-01 



3-40 



103 





HoO- 



C0 2 



TiO a 



P 2 5 



Cr 2 3 



MnO 



CI 



Total 



Sp. gr. 



I 



0-30 



none 



0-70 



o-io 



tr. 



tr. 



tr. = 



100-35 



2-51 



II 



0-50 



tr. 



1-20 



0-31 



0-05 



tr. 



tr. = 



100-21 



2-90 



III 



0-95 



tr. 



1-20 



0-32 



0-05 



tr. 



tr. = 



100-13 



2-95 



IV 



0-18 



o-io 



0-50 



0-25 



0-04 



tr. 



tr. = 



99-87 



2-54 



I Hypersthene andesite perlite (adamellose) Leleppa Island. 



II Basalt porphyrite (hessose) Mau Island. 



III Basalt porphyrite, dike (auvergnose) Fatrnalapa, Efate Island. 



IV Hornblende andesite (harzose) Wai Malikoliko, S. W. Santo. 



In concluding the author notes that the coral formations in 

 recording crustal movements have developed three main types of 

 islands corresponding to as many possible land-movements. 



First, in regions of continuous upheaval, islands veneered with 

 coral limestone terraces like the New Hebrides. 



Second, on subsiding areas, islands which are typical atolls 

 like those of the Ellice group. 



Third, in regions of both upheaval and subsidence, islands in 

 which coral limestones are interbedded with volcanic submarine 

 tuffs or other products ; seen in the larger islands such as Viti 

 Levu of the Fiji group. 



The work is accompanied by a number of maps and interesting 

 photographs of the island scenery, rock sections, etc., and is an 

 excellent contribution to Pacific geology. L. v. p. 



5. Salient Geological Features of British Ntw Guinea ; by 

 A. G. Maitland, West Aust. Nat. Hist. Soc, April 11, 1905, 

 26 pp. — This gives a brief resume of the observations made by 

 the author in a trip along the coast in a Government vessel with 

 excursions inland. It was found that the coastal districts and 

 many of the adjacent islands were composed of extinct volcanoes 

 and their ejections and on the northeast coast and the Louisade 

 Archipelago of horizontal limestones, upraised coral formations. 

 A large portion of the backbone of the mainland is formed of 

 ancient crystalline rocks with bedding at high angles. The 

 country is beginning to yield an increasing amount of gold, 

 amounting in the year 1902-03 to over $200,000. l. v. p. 



6. Geological Survey of Canada : Robert Bell, Director. 

 — The following publications have recently appeared : 



Annual Report, Part B. Report on the Klondike Gold 

 Fields ; byR. G. McConnell. Pp. 71, with colored map. This 

 gives the results of field work carried on during the season of 

 1903. 



Part J. Report on the Geology of a Portion of Eastern 

 Ontario ; by R. W. Ells. Pp. 89, with colored map. 



Recent Mineral Discoveries on Windy Arm of Tagish Lake, 

 Yukon ; by R. G. McConnell. Pp. 12. The quartz veins 

 described carry various silver and copper ores. 



