272 PROCEEDINGS OF THE SOCIETY. 



the Society not only for the opportunity afforded him of showing what 

 was to him a series of illustrations of remarkable interest, but also to 

 the Fellows present that evening for the patient manner in which they 

 had listened to what, he feared, had taken more time than he hud 

 anticipated. 



In further illustration of the subject a large number of specimens 

 were exhibited in the room at the close of the Meeting. 



The following Instruments, Objects, etc., were exhibited : — 

 Mr. J. E. Stead : — Lantern slides and the following specimens in 

 illustration of his lecture. 



A. Soft plates of pure iron, soldered together by phosphide of iron, 

 and forged from 1 in. to ^ in. in thickness. One portion was annealed 

 at 1:550°, the other was not annealed. Both were polished and heated 

 at one end in a lead bath, so as to produce heat-oxidation tints. The 

 unannealed specimen showed blue phosphide lines on a brown ground. 

 The tints on the annealed portion were uniform, showing that the 

 phosphide had completely diffused. 



B. Alternate plates of wrought iron, containing 0*01 p.c. and 

 0* 25 p.c. phosphorus welded together, sectioned and polished, and etched 

 with picric acid solution, which coloured the phosphorised iron brown, 

 but left the pure iron white. 



C. Wrought iron of commerce, polished, heat-tinted, and slightly 

 etched with very dilute nitric acid. The section showed a series of 

 differently coloured bands, the colour varying with the amount of 

 phosphorus in the iron. 



D. Puddled bar, polished and etched with picric acid, which coloured 

 the more highly phosphorised parts brown. 



E. Segregationed steel bar, etched with picric acid, showing a brown 

 patch in the centre, high in phosphorus. 



F. Steel bar containing 1 ■ 3 p.c. carbon, which had been heated at 

 one end to whiteness, and after cooling to 800° C. it was quenched in 

 water. The constituents — martensite, troostite, sorbite, and pearlite — ■ 

 were all visible in the picric-acid etched metal. 



G. Compound steel safe plate, composed of alternate layers of steel, 

 with • 05 p.c. carbon, and steel with " 9 p.c. carbon, etched with 

 picric acid. The hard steel was coloured brown, the soft steel remained 

 white. 



H. Loluca meteorite, polished and heat- tinted. The Widmanstatten 

 structure was very perfectly developed. 



I. A steel forging, containing what is known as a phantom or ghost, 

 or an area leriticular in section, high in sulphur and phosphorus. The 

 phantom had a blue tint on a ground-mass coloured brown. The colours 

 were developed by heat-tinting. 



J. Messrs. J. Swift and Son : Mr. Stead's External Cover-glass 

 Reflector for low-power objectives for illuminating opaque objects. 



New Fellows: — The following were elected Ordinary Fellows: 

 Messrs. George Albert Evans, John Mastin, and Eliezer Moffat. The 

 following were elected Honorary Fellows : Professor William Gilson 

 Farlow, Professor Herbert S. Jennings, Professor Edmund B. Wilson, 

 and Professor R. W. Wood. 



