758 SUMMAKY OF CUEKENT RESEARCHES RELATING TO 



Pionchon, Harker, and others, are stated. Preliminary experiments 

 with the water calorimeter and the Bnnsen ice calorimeter led to the 

 selection of the latter for the author's determinations. The sample 

 (iron containing * 06 p.c. carbon and * 05 p.c. manganese) was heated 

 in vacuo by means of a resistance furnace. For very high tempera- 

 tures the furnace resistance was a carbon spiral cut from a tube. A 

 detailed description of the apparatus evolved by the author is given. 

 The following values (mean specific heat between the given temperature 

 and 0°C.), selected from the author's table, show the course of the curve. 

 The rapid rise from 050-750° C. is notable. 



250° C. 0-1221 

 650° C. 0-1463 

 750° C. 0-1675 



800-900° C. (practically constant) 0-16'.)8 

 1100-1500° C. „ „ 0-1661-0-1667 



The course of the curve in the neighbourhood of Ar 2 renders it 

 highly probable that the transformation of /3 to a iron proceeds through 

 a continuous series of mixed crystals, as suggested by Osmond. The 

 specific heat of y iron is practically constant. A useful bibliography is 

 appended. 



Capacity of Metals to Form Compounds with each other.* — 

 G. Tammann gives a table showing the well established metallic com- 

 pounds (about 100), and attempts to draw some general conclusions. 



Beaune, H. — Nitrogen Absorption in Cementation. 



Stahl unci Eiscn, xsvii. (1907) pp. 1395-8. 



„ Micrographic Investigation of Iron and Steel. 



Eisen-Zeitnng, 1907, pp. 223-4. 243-5, 259-60, 276-7. 



CoEHN, A., & C. L. Jacobsen — Electrochemical Behaviour of Gold and its 

 Passivity. Zeitschr. Anorg. Chem., Iv. (1907) pp. 321-55 (11 figs.). 



DucELLiEZ, F. — Cobalt-tin Alloys. 



Comptes Rendus, cxlv. (1907) pp. 431-3 and 502-4. 



Philips, M.— Silicon-copper. Metallurgie, iv. (1907) pp. 587-92 and 613-17. 



PoucHiNE — Electromotive Force of Alloys. 



Rev. de Metallurgie, iv. (1907) pp. 926-35 (22 figs.). 

 [Wologdine gives a lengthy abstract of the paper summarised in this 

 Journal, 1907, p. 642.] 



ViGOUEOux, E. — Nickel-tin Alloys. Comptes Rendus, cxlv. (1907) pp. 429-31. 



Walkee, W. H., & L. N. Bent — Corrosion of Iron and Steel. 



Journ. Amer. Chem. Soc, sxix. (1907) pp. 1251-64. 



Influence of Chemical Composition and Structure on the Rusting of Iron and Steel. 



StaJil imd Eisen, xxvii. (1907) p. 925. 



* Zeitschr. Anorg. Chem., Iv. (1907) pp. 289-96. 



