June 29, 1906.] 



SCIENCE. 



971 



ond specimen of this species that the writer 

 recognized in a small collection of fishes 

 from the Tertiary deposits of Horsefly 

 River, B. C. This second specimen is much 

 more perfect than the hitherto only known 

 specimen and type from the north fork of 

 the Similkameen River. The other speci- 

 mens from Horsefly River, found in asso- 

 ciation with the second specimen of Amyzon 

 hrevipinne, are referred to A. commune 

 Cope, the characteristic fish of the Amyzon 

 beds of Colorado. With the discovery of 

 a scale from the Similkameen beds, refer- 

 able to A. commune, a fish fauna of two 

 species common to the Similkameen and 

 Horsefly beds is completed. The assign- 

 ment of an equal age to the Horsefly and 

 Similkameen deposits follows, and Cope's 

 correlation of the latter beds with the 

 Amyzon beds of Colorado and Nevada is 

 strengthened. The beds near Tranquille, 

 Kamloops Lake, holding remains of A. 

 com.mune are also regarded as belonging to 

 the same horizon. 



'Observations on and Criticisms of 

 Microchemical Methods,' by Dr. A. B. 

 Macallum. 



'The Structure of the Mesogloea in the 

 Medusffi, Aurelia flavidiila and Cyanea 

 arctica,' by Dr. A. B. Macallum. 



' On the Structure of an Abnormal Chick 

 Embryo,' by Professor R. Ramsay Wright. 



The case discussed is an interesting one 

 of Duplicitas anterior, which supplements 

 those previously recorded. It shows no 

 indication of a second primitive streak, but 

 otherwise resembles most closely those de- 

 scribed by Hoffman and Kaestner. 



'A Chapter in Comparative Physiology 

 and Psychology,' by Dr. T. Wesley Mills. 



The paper treats of the habits of a 

 hawk and a crow as observed in confine- 

 ment in the laboratory, together with an 

 account of some physiological experiments 

 made with a view to throw light upon the 



nature of the brain and the psychic organi- 

 zation of the bird. 



'South African Iron Formations,' by 

 Professor A. P. Coleman. 



During the visit of the British Associa- 

 tion to South Africa, rocks formed of iron 

 ore interbanded with jasper or granular 

 silica were studied at Johannesburg and 

 Salisbury, while similar specimens were ob- 

 tained from other parts of the subconti- 

 nent, all very like rocks of the iron forma- 

 tion of northern Ontario and the Lake 

 Superior region. In South Africa these 

 iron-bearing rocks are in general not so 

 ancient as in America, though lower than 

 the lowest known fossiliferous rocks. The 

 conditions under which they were deposited 

 in these two regions, so widely separated, 

 seem to have been much the same ; and 

 conditions of the same kind have appar- 

 ently not been repeated in later ages. 



'Some Experimental Investigations into 

 the Flow of Rocks,' by Professor Frank D. 

 Adams. 



The paper gives a brief account of 

 some experimental work bearing upon the 

 behavior of rocks when submitted to great 

 pressure and under conditions similar to 

 those which exist in the deeper parts of 

 the earth's crust. 



'Gypsum Deposits of New Brunswick, 

 with Special Reference to their Origin, ' by 

 Professor L. W. Bailey. 



The gypsum deposits of New Bruns- 

 wick are among the most important to be 

 found in Canada, and have long been the 

 basis of large and profitable industries, the 

 annual export from a single locality, that 

 of Hillsboro, in Albert County, to the 

 United States, having been, for some years, 

 not less than 20,000 barrels of manfactured 

 plaster, in addition to from 25,000 to 

 50,000 tons of crude gypsum, besides a 

 large amount used for Canadian consump- 

 tion. The very extensive operations here 

 referred to, carried on below as well as 



