Accordingly, in this year he set down the result of his studies in the classical paper which he submitted to the Académie des Sciences de France under the title, "Mémoire sur la voix humaine," to which was added the rather odd-sounding subtitle, "Description des produits du phonateur humain." In it he embodied the various discoveries which he had made relating to the larynx. Among the principal points to which he drew attention were the following:-- (1) The head voice does not necessarily begin where the chest voice ends, and a certain number of notes can be produced in either register. (2) The chest voice and the head voice are produced by a special and spontaneous modification of the vocal organs, and the exhaustion of the air contained in the chest is more rapid in the proportion of four to three in the production of a head than a chest note. (3) The voice can produce the same sounds in two different timbres--the clear or open, and the sombre or closed. The memoir on the human voice was duly reported on by Majendie, Savart, and Dutrochet at a public meeting which was held on April 12, 1841, the result being that this resolution was passed: "The thanks of the Academy are due to Professor Garcia for the skilful use which he has made of his opportunities as a teacher of singing to arrive at a satisfactory physical theory of the human voice." The circumstance gave occasion for a somewhat acrimonious discussion concerning certain points of priority as between Garcia and MM. Diday and Pétrequin, two French scientists. This was followed up by the publication of the 'Method of Teaching Singing,' in which Garcia cleared up the confusion which had hitherto existed between "timbre" and "register." He defined the expression "register" as being a series of consecutive homogeneous sounds produced by one mechanism, differing essentially from another series of sounds equally homogeneous produced by another mechanism, whatever modifications of "timbre" and of strength they may offer. "Each of the registers," he added, "has its own extent and sonority, which varies according to the sex of the individual and the nature of the organ." At this time he stated that there were two registers; but in later years, with the invention of the laryngoscope and the examination of the vocal cords which resulted from it, he altered the original division from two to three--chest, medium, and head-voice,--and this is accepted by all as scientifically correct according to the definition of "register" laid down by him. The year which found Manuel Garcia presenting his paper to the Académie des Sciences saw his sister Pauline married to Monsieur Viardot, by whom she had been engaged for her first season at the Paris Opera House. Almost immediately after the wedding her husband resigned his position, so as to accompany her on her tours through Italy, Spain, Germany, Russia, and England.