The Quarterly Journal, Volume 22

achromatic angle aperture aplanatics appears applied ascertained baryta bodies brome carbon cause chemical chloric acid chlorine circumstances coal series colour combination common compound consequently considerable considered containing continued fraction crystals cylinder decomposed degree deposites distance effect electricity elevation employed equal equation exist experiments fact Farn Island feet felspar fire fluid fraction glass gneiss granite heat hydrogen hygrometer inches instrument latter leech length lignites limestone magnetic manganese mass mean mercury metal microscope mineral mixture muriatic nature naval naval architecture needle nitric acid object object-glass observed obtained occur origin oxide oxygen paper pendulum perfect phenomena portion potash present probably produced proportion proved quantity remains remarkable respect result salt sandstone schist secondary strata ships similar solar solution strata substance sulphuric acid supposed surface temperature theory tion trap tube unstratified rocks vapour veins volcanoes weight wire