ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 531 



New Method of Coating with Metals.* — U. Schoop describes a 



process of coating objects with a metallic layer. The metal is melted 

 and projected against the object to be covered, as minute drops or 

 powder, by means of a blast of reducing or inert gas at very high 

 velocity. A remarkably homogeneous and adherent coating is obtained 

 in this way. The process may be used for coating objects with aluminium. 



Influence of Pressure on the Boiling-points of Metals.f — H. C. 

 Greenwood has determined the boiling-points of bismuth, copper, lead, 

 silver, and tin, at pressures in the neighbourhood of 100 and 250 mm. 

 mercury. Boiling-points were determined at high pressures as follows : — ■ 

 Lead up to 11*7, bismuth up to 16 '5, zinc up to 53 atmospheres. The 

 effect of pressure was found to be very considerable ; at 102 mm. bismuth 

 boils at 1200° C, while at 16 ■ 5 atmospheres the boiling-point is 2060° 0. 

 For each metal the values of the boiling-points lie on a smooth curve. 



F. Henning. — "liber ein Spektralpyrometer und einige optische Konstanten von 

 Metallen. Zeitschr. f. Instrumentenk., xxx. (1910) pp. 61-75 (2 figs.). 



W. Bbown. — Permanent Steel Magnets. 



Sci. Proc. Boy. Dublin Soc, xii. (1910) pp. 312-20 (3 figs.). 



„ ,, Chrome Steel Permanent Magnets. Tom. cit., pp. 349-53 (1 fig). 



D. Stenquist. — Alloys of Lead and Tin. 



[A determination of the hardness of twelve alloys.] 



Zeitschr. Phys. Chem., lxx. (1910) pp. 536-8 (2 figs.) 



* Comptcs Rendus, cl. (1910) pp. 1014-6. 



t Proc. Roy. Soc., Series A, lxxxiii. (1910) pp. 483-91 (4 figs.). 



