ZOOLOGY AND BOTANY, MICKOSCOPY, E'J C. 563 



Composition of Eutectics.*— K. Losew has studied microscopically 

 the alloys of cobalt and antimony, and of nickel and antimony, as 

 examples of systems stated to contain eutectics differing but slightly 

 from one of the pure metals. The uniformity in the composition of such 

 eutectics has been questioned. The results' indicate the improbability 

 of the existence of eutectics approximating to pure antimony in the two 

 systems. 



Electrical Conductivity of Alloys. t—W. Broniewski reviews the 

 work which has been carried out upon the relation of constitution of 

 alloys^ to their electrical conductivity and temperature coefficient of 

 electrical resistance, and summarizes the general conclusions established. 

 A comprehensive bibliography (1S27-1910) is appended. 



Electrical Conductivity of Molten Metals.}— E. Wagner finds that 

 in many cases the conductivity of a solid metal at the melting-point is a 

 simple multiple of the conductivity of the liquid metal at the same 

 temperature. An explanation based on the electron theory is advanced. 



Influence of Pressure on the Melting-points of Metals. §— J. John- 

 ston and L. H. Adams have constructed an apparatus suitable for studying 

 chemical and physical reactions at temperatures up to 400° C. and under 

 pressures up to 2000 atmospheres. Both temperature and pressure in the 

 reaction zone could be accurately measured. The change with pressure 

 of the melting-point of tin, bismuth, lead and cadmium was found to be 

 a linear function of the pressure. The melting-point of tin, cadmium 

 and lead rises with increase of pressure ; that of bismuth falls. The 

 difference between melting-point at 1 and 2000 atmospheres is 6*57° C. 

 for tin, 12'61° for cadmium, 16 "OS for lead, and 7*15° for bismuth. 



Bornemann, K. — Binary Metal Alloys. 



[Further instalments of the author's summarized account of the binary 

 systems. See this Journal, 1909, p. 787 ; and 1910.] 



Metallurgie, vii. (1910) pp. 572-9, 603-7 (39 figs.). 

 Burgess, C.F., & J. Aston — Some Alloys for Permanent Magnets. 



Met. and Client. Engineering, viii. (1910) pp. 673-6. 



Campbell, W., & F. C. Elder — Notes on Lead-tin-antimony Alloys. 



[The compositions of numerous bearing metals and other alloys are given, 

 with some account of the equilibrium diagram of the ternary systems 

 and the structure of the alloys.] 



School of Mines Quart., xxxii. (1911) pp. 244-55. 



Grard — Hardness and Brittleness of Steels. 



Rev. Metallurgie, viii. (1911) pp. 241-74 (14 figs.). 



Go pel, F.— Blueing of Steel. Deutsche Mech. Zeit., 1911, pp. 121-3 (11 figs.). 



Guillet, L., & L. Re villon — New Shock Tests at Variable Temperatures. 



Rev. Metallurgie, vii. (191i ) pp. 837-44 (1 fig.). 



Hadfield, R. A. — Experiments on Segregation in Steel Ingots. 



Tom. cit., pp. 1133-6 (6 figs.). 



* 



J. Russ. Phys. Chem. Soc, xliii. (19il) pp. 375-92, through Journ. Soc. 

 Chem. Ind., xxx. (1911) p. 694. 



t Rev. Metallurgie, viii. (1911) pp. 320-34. 



t Ann. Physik., xxxiii. (1910) pp. 1484-92, through Journ. Chem. Soc, c. (1911) 

 p. 177. 



§ Amer. Journ. Sci., xxxi. (1911) pp. 501-17 (4 figs.). 



