Nevertheless, this great invention of aerial navigation has remained almost barren. If we except the celebrated aerial voyage of Gay-Lussac in 1804, the balloon, with its wonderful powers, has been allowed to degenerate into a mere theatrical exhibition, exciting the vacant and unreflecting wonder of the multitude. Instead of being an instrument of philosophical research, it has become a mere expedient for profit in the hands of charlatans, so much so, that, on the occasion to which we are now about to advert, the persons who engaged in the project incurred failure, and risked their lives, from their aversion to avail themselves of the experience of those who had made aerostation a mere spectacle for profit. They thought that to touch pitch they must be defiled, and preferred danger and the risk of failure to such association. It is now about two months since M. Barral, a chemist of some distinction at Paris, and M. Bixio, a member of the Legislative Assembly (whose name will be remembered in connection with the bloody insurrection of June, 1848, when, bravely and humanely discharging his duty in attempting to turn his guilty fellow-citizens from their course, he nearly shared the fate of the Archbishop, and was severely wounded), resolved upon making a grand experiment with a view to observe and record the meteorological phenomena of the strata of the atmosphere, at a greater height and with more precision than had hitherto been accomplished. But from the motives which we have explained, the project was kept secret, and it was resolved that the experiment should be made at an hour of the morning, and under circumstances, which would prevent it from degenerating into an exhibition. MM. Arago and Regnault undertook to supply the aerial voyagers with a programme of the proposed performance, and instruments suited to the projected observations. M. Arago prepared the programme, in which was stated clearly what observations were to be made at every stage of the ascentional movement. It was intended that the balloon should be so managed as to come to rest at certain altitudes, when barometric, thermometric, hygrometric, polariscopic, and other observations, were to be taken and noted; the balloon after each series of observations to make a new ascent. The precious instruments by which these observations were to be made were prepared, and in some cases actually fabricated and graduated, by the hands of M. Regnault himself. To provide the balloon and its appendages, recourse was had to some of those persons who have followed the fabrication of balloons as a sort of trade, for the purposes of exhibition.