Calendar: 1880-1881 Page 688

688 CLOTHWORKERS' SCIENCE EXHIBITIONS What minerals resemble the diamond and how can the diamond be distinguished from those minerals in crystalline form fracture hardness and specific gravity What are the characters by which you can distinguish in ores the presence of arsenic cobalt iron lead manganese and mercury before the blowpipe Give the physical characters and chemical composition of three of the following minerals adularia-calcite-cin nabar-galena-lapis lazuli malachite opal selenite zircon י Arrange the following rocks amygdaloid-basalt- chalk-clay-slate-gneiss-granite mica-slate-obsidian oolite-porphyry-serpentine syenite sandstone in the four divisions of aqueous volcanic plutonic and meta- morphic rocks What plan would you follow and what methods would you adopt in collecting the minerals and rocks of new country and in working out its geology VII -e ologt In what way do rain ice the sea and vegetation effect changes in the structure of the crust of the earth Give illustrations Define the terms joints-faults-anticlinals How do you distinguish interbedded from intrusive volcanic rocks Explain Darwin's theory of coral reefs Give the subdivisions of the Jurassic system and refer to some of the characteristic fossils in that group of beds Mention the principal phosphatic deposits in England How do you account for their occurrence Draw and explain section which depicts the succession of the different strata between London and Brighton State the range in time of Nautilus Ananchytes and Lingula