Calendar: 1883-1884 Page 673

CLOTHWORKERS SCIENCE EXHIBITION 669 VIII jKrncraTogp What is the difference between ordinary and double refraction 1Mention two minerals possessing the latter characteristic Define adamantine and glimmering lustre and give examples State what you know of twin and hemihedral crystals Describe the Rhombic system crystal is found to be combination of the forms and co 00 Sketch its outline Distinguish between Amethyst Cairngorm Jasper Opal and Chalcedony What metals can be obtained from Jamesonite Calamine Cerussite and Limonite Mention the chemical composition appearance and name of the minerals composing granite portion of rock weighs in air 12498 grains and in water 87 grains What is its specific gravity 10 To what series of blow-pipe operations would you subject an unknown mineral in order to determine its composition IX -Cfctmfetro Ten cubic centimetres of certain gas are entirely absorbed by water yielding strongly alkaline solution ten cubic centimetres of another gas yield strongly acid solution On mixing the solutions neutral liquid is obtained Name the gases The water from spring has very offensive smell which disappears on exposure to air the water at the same time becoming clouded Give the probable chemical explanation How may carbon in the free state be obtained from carbonic acid gas Write the symbols for the atoms and molecules of