Volume 4. Scientific and miscellaneous papers 1 I Barometrical observations made at the Fall of the Staubbach, with J. F. W. Herschel (1822) II Extracts from Scriptores optici, with F. Maseres, editors (1823) III Observations on the measurement of heights by the barometer (1824) IV Rates of The Protector Life Assurance Society (1824) V Account of the repetition of M. Arago’s experiments on the magnetism manifested by various substances during the act of rotation, with J. F. W. Herschel (1825) VI On a new zenith micrometer (1826) VII On electrical and magnetic rotations (1826) VIII Diving-bell (1826) IX On the proportionate number of births of the two sexes under different circumstances (1829) X Sur l’emploi plus ou moins frequent des memes lettres dans les differentes langues (1831) XI On the proportion of letters occurring in various languages, translation XII To the electors of the Borough of Finsbury (1832) XIII Mr Babbage’s address to the electors of the Borough of Finsbury (1832) XIV A word to the wise (1833) XV Abstract of a paper entitled Observations on the Temple of Serapis at Pozzuoli (1834) XVI Letter decyphered by C. Babbage (1835) XVII Letter from Mr Babbage to the members of the British Association for the Promotion of Science (1839) XVIII Description of the boracic acid works of Tuscany (1843) XIX The Planet Neptune and the Royal Astronomical Society’s Medal (1847) XX Observations on the Temple of Serapis at Pozzuoli near Naples (1847)