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FOOTNOTES:
[1] Royal Institution of Great Britain.
[2] Comptes Rendus of the French Academy of Sciences.
[3] It is often desirable to make one of the apertures twice the diameter of the rest; it causes a greater intensity to be given to one image, and that facilitates the calculation of time, while it furnishes points for the comparison of the movements of the lower limbs with those of the arms.
[4] Ang. Guerout, in La Lumiere Electrique.
[5] Abbe Moigno, in his treatise on telegraphy, assigns the date of 1838 to this publication; but Mr. Zetsche (d.c.) gives it as 1811. We shall consider the latter as the true date; for, in 1838, there was no reason for publishing Soemmering's memoir, and especially for proposing improvements in his apparatus.