ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 517 



Aluminium Zinc Alloys.* — E. S. Shepherd determined the densities 

 of 11 alloys of aluminium and zinc, and from the form of the specific 

 volume curve concluded that the phases present were approximately pure 

 zinc, and a solid solution of zinc in aluminium with a limiting concen- 

 tration of about 50 p.c. Cooling curves of the alloys containing 60 and 

 50 p.c. aluminium did not indicate any evolution of heat at the solidify- 

 ing point of the eutectic, while the 50 p.c. alloy gave an evolution of 

 heat. Alloys with more than GO p.c. aluminium are microscopically 

 homogeneous. At 60 p.c. some intercrystalline material is present : this 

 disappears on annealing. A true eutectic is present in the 40 p.c. alloy. 

 The author holds that the pyrometric and microscopic data are in perfect 

 agreement with the deductions based on the specific volume relations. 

 This series of alloys presents no definite compounds ; there are two solid 

 solutions, zinc in aluminium (maximum 50 p.c.) and aluminium in zinc 

 (4 p.c), which form a eutectic containing about 5 p.c. aluminium. 



Anon. — Metallurgical Research at the National Physical Laboratory. 



Engineering Times, 1906, p. 218. 

 „ Rusting of Iron. 



[A brief account of the theories of Dunstan, Moody, and others, as 

 to the chemical reactions which take place when rust forms on 

 iron.] Nature, lxxiv. (1906) pp. 116-17. 



Arnold, J. O. — The Internal Architecture of Metals. 



Engineering, 1906, pp. 278-9. 



Andrews, T. — Microscopic Observations on Naval Accidents. 



Tom. cit., pp. 331-2. 



Bach, C. — Strength of Mild and Cast Steel at High Temperatures. 



Tom. cit, pp. 401-4 (7 figs.). 



Dixon, E. — Nickel and Carbon Steels. Tom. cit., pp. 22-3. 



Hadpield, R. A. — Unsolved Problems in Metallurgy. 



Engineering Times, 1906, p. 312. 

 Longmuir, P. — Manganese Bronze. 



[Describes the properties of a number of alloys, and points out that iron, 

 aluminium, aud manganese each have the effect of raising the tenacity 

 of copper-zinc alloys (brasses). High casting temperature has an in- 

 jurious effect upon manganese bronze.] 



Foundry, xxvi. (1905) pp. 116-18. 

 Olsen, T. Y. — Fragility of Iron and Steel. 



[The Fremont method of determining brittleness is described, with full 

 details of the construction of the machine, and a discussion of the 

 advantages offered by the impact test.] 



Tom. cit., pp. 125-33 (8 figs.). 



Peake, A. H. — A Novel Instrument for Illustrating the Magnetic Properties of 

 Iron. Proc. Camb. Phil. Soc, xiii. (1906) pp. 250-7 (7 figs.). 



Smith, J. K. — Vanadium and its Services to Steel Manufacture. 



Engineering Times, 1906, p. 218. 



Steinhart, O. J. — Notes on Metals and their Ferro-Alloys used in the Manu- 

 facture of Alloy Steels. Iron and Steel Mag., xi. (1906) pp. 394-400. 



* Journ. Phys. Chem. x. (1906) pp. 504-12 (2 figs, and 5 photomicrographs). 



