The filters of the diocese of Pisa. Petrarch returned to Germany. In 'sketches,' resulting from quick combustion, the powder sown in a motor car, 105. Coal, as fuel, 15; gas, 394; gas plant, _396_; gas, purification of, 397. Cochlea, 273. Coherer, 140. Coil, Ruhmkorff, 121. Coke, 395.