ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 787 



up to 4 p.c. arsenic in solid solution at 700° C. The curve showing the 

 relation between composition and electrical resistance has an inflection 

 at -i p.c. arsenic. 



Belloc, G.— Occluded Gases in Steel. 



„ „ Occluded Gases in a Special Nickel-steel,^ 



[More complete accounts of work previously summarised. 

 See this Journal, 1908, pp. 124 and 661.] 



Rev. MHallurgie, v. (1908) pp. 469-88 (5 figs.) ; 



and pp. 571-4 (2 figs.). 



Feiedrich, K. — Contribution to the History of Metallography. 



Mctallurgie, v. (1908) pp. 408-10. 



Friedbich, K., & A. Leeoux— Binary Systems Cu-Cu.,Se, Ag-Ag.,Se, Pb PbSe. 



Tom. ~cit,, pp. 355-8 (11 figs.). 

 Guebtlee, W. — Electrical Resistance of Alloys. 



[The bearing of recent researches on technical applications of alloys is in- 

 dicated.] Tom. cit., pp. 292-6. 



Poetevin, A. — Alloys of Aluminium. 

 „ „ Alloys of Copper. 



„ „ Alloys of Iron. 



„ Alloys of Manganese and Alloys of Magnesium. 



[Further instalments of Portevin's account of the Gbttingen 

 researches. See this Journal, 1908, pp. 522-23. 

 Rev. Metallurgie, v. (1908) pp. 274-94 (25 figs.) ; 361-95 (40 figs.) ; 



535-60 (28 figs.); and 762-90 (38 figs.). 



>» 



