Calendar: 1868-1869 Page 530

532 MEDICAL DEPARTMENT each additional what would be the bulk of cubic foot of air at 60 when raised to temperature of 500 And if 100 cubic inches of air at 60 weigh 31 grains what would be the weight of cubic foot at 500 Explain the action of the gold leaf electroscope Show how it may be used to distinguish positive from negative elec- tricity In what way does Harris's Unit Jar enable you to measure out electricity Describe the construction of cell of Daniell's battery In what kind of cases is it more useful to employ several cells And when may you advantageously employ single cell of large size to increase the effect Describe the astatic galvanometer IV -C&emtitrg Describe Dumas' method of determining the proportion of oxygen in the atmosphere Explain how hydrogen may be used for the determination of the amount of oxygen in air Explain in symbols the changes which accompany the action of zinc on sulphuric acid of copper on nitric acid and of mercury on sulphuric acid and describe the gaseous products obtained in each case How is caustic potash obtained Give the reactions by which you distinguish between the salts of calcium sodium potassium and ammonium when in solution Describe the preparation of sulphuretted hydrogen How is its composition ascertained Give in symbols its reactions upon solution of ammonia upon hydrated ferric oxide upon cuprio chloride and upon plumbic sulphate What are the principal ores of lead Sketch the operation of lead smelting State how you would prove the presence of lead in water Describe the modes of preparing calomel and corrosive sublimate How do you distinguish these salts By what means would you ascertain the presence of mercury in the stomach after death