274 



Note on " On a New Form of Stereoscope!' [Nov. 1 8, 



Alphabetical List of 

 Temperatur 



Aerolite, a. 

 „ b. 



Albite, transparent crystals . . . 

 Ainphibole, black crystals .... 

 Apatite, translucent, green. . . . 



„ opaqtie white-pink. . . . 

 Aragonite, transparent crystals 

 Barite, transparent crystals . . . 



„ opaque lamellar 



,, opaque, massive 



Basalt, fine black . . 



Beryl, transparent crystals. . . . 



„ sub translucent 



Biotite, black 



Calcite, Iceland spar 



„ translucent rhombohe- 



dron 



hexagonal prisms .... 



j> >> }>••••• 



,, chalk. . . . . 



Chalcopyrite, bright, iridescent 



Corundum, clouded 



Cryolite, translucent 



Epidote, crystals, dark green. . 

 Fluorite, tx'ansparent crystal . . 



,, translucent 



G-alenite, crystals 



„ crystalline 



Garnet, red crystals. . . 



,, a red crystal. . 

 Granite, Aberdeen. . . . 



„ Wexford .... 



,, Killiney 

 Gypsum, rough, white 



„ acicular .... 



„ selenite .... 

 Hematite, botryoidal, 



gent 



diver- 



the Specific Heats of some Minerals, 

 e limits about 12° C. to 100° C. 

 Sp. h. 



*1787 Hornblende, trap-rock, fibrous, 



0*1785 green 



"1856 Hypersthene, massive, cry stal- 

 er 1983 line 



*1963 Labradorite, grey, chatoyant. 



0*1829 Lepidolite, massive, crystal- 



1920 line 



"2036 Leucite, crystals 



0*1096 Limonite, crystalline, massive 

 0'1117 ,, fibrous, divergent. . 



-1032 Malachite, botryoidal 



0*1996 Microcline, cross hatched. . . . 

 *2066 „ fawn-coloured . . . 



*2127 Muscovite, silvery 



*2057 Natrolite, translucent crystals 



*2036 Oligoclase, sub transparent . . 



„ white, subtranslu- 



*2044 cent 



*20 i4 Orthoclase, transparent adu- 



-2091 laria 



0*2040 „ subtranslucent, 



0*1271 opaque. 



*1981 Phrenite, botryoidal, green . . 



*2548 Pyrites, cubes 



*1877 Quartz, limpid 



0*2118 „ transparent, hyalite. . 



*2126 „ white opal 



*0505 Serpentine, green 



0*0492 Slate, fine green 



'0522 Sphalerite,, well crystallised. . 



*1780 „ crystalline 



*1793 Stilbite, white radiating (dry) 



0*1892 Talc, greenish- white so apstone 



0*1940 Topaz, transparent, colourless 



0*1927 Tourmaline, black crystals. 

 0*2737 ,, brown crystal; 



0*2717 Vesuvianite, green crystals 



0*2721 Wernerite, opaque crystals 

 Witherite, translucent .... 



0*1683 





Sp. h. 



0*2113 







1790 



o 



1933 



o 



•2097 







1912 







•2215 







2263 







1766 







1915 







•1905 







•2049 







•2375 







•2059 







•1997 







•1869 







•1890 







•2003 







•1306 







•1881 







•2033 







•2375 







•2529 







•2069 







•1144 







1159 







■2621 







•2168 







•1997 







•2004 







•2111 







•1949 







•2003 







•1086 



III. il Note on a paper entitled ' On a New Form of Stereoscope ' 

 ('Roy. Soc. Proc.,' vol. 40 y p. 317)." By A. Stroh. Com- 

 municated by Lord Rayleigh. Received September 28, 

 1886. 



Since the reading of my paper on " A New Form of Stereoscope " 

 (' Roy. Soc. Proc.,' vol. 40, p. 317) my attention lias been called to a 

 paper read by Mr. Howard Grubb, F.R.A.S., at the Royal Dublin 

 Society, 20th January, 1879. 



I. find that this paper describes the essential points of the apparatus, 

 and I therefore desire to acknowledge the prior publication by 

 Mr. Grubb. 



