This solar spectrum contains measures of about 2000 fixed lines, or fully a third more than are represented in Ångström's worthily celebrated Normal Solar Spectrum Map, which is taken as the standard reference for “place.” The observations were made in Lisbon during the summers of 1877–8, with apparatus prepared by the author; who aimed at including everything visible, from the extreme red to the extreme violet ends of the spectrum, so far as that is amenable to the human eye after transmission through glass.