Calendar: 1879-1880 Page 644

644 cl0thw0bkeb8' science exhibition What is the specific gravity of mineral the weight of which in air is 240 grains and in water 53 grains Describe the principal characters of calcite and rock crystal General form of the crystal Fracture Hardness Specific gravity Action of acids Action of blowpipe Describe the crystalline form and chemical composition of augite diamond and stilbite Describe the mineralogical composition and geological origin of the following rocks chalk-clay-slate-granite- mica-slate-obsidian and sandstone What crystalline forms can be obtained from rock-salt calcareous spar and fluor-spar by cleavage VI jologj Describe the present configuration of the Downs bordering the Weald of Kent and account for the differences of slope on the summit and south side of the chalk range Give instances of alterations in the margins of British coast lines and explain by what causes those changes have been produced Define the meaning of the terms paL cozoic mesozoic and cainozoic What are reversed faults State the chief divisions of the carboniferous and cretaceous systems To what part of the geological scale do you assign the crag and miocene Mention strata which are older and newer than the gault and prove your statement by an appeal to observed facts What are characteristic fossils Describe two which are so designated Mention fossil foraminifera which have contributed to the increase of the rock-masses