A gentleman connected with Sir CHARLES DANCE, the patentee of
the steam-carriage which has been running for the last six or seven days between London and Greenwich; has received a letter from the French. Government, from which it appears that they are desirous of establishing steam-carriages in France, probably for the purpose of conveying the mail. According to a calculation before us, this would be a great eco- nomy: the cost of sending a steam-carriage with ten or twelve passen- gers a distance of one hundred miles, would not be one-eighth of what it is now by employing the Maitres des Postes. The coke for that distance would not cost 12 francs, and the guide and engineer would be well paid with the like sum ; so that the distance would be performed for Il. Then, instead of four passengers, the number -now conveyed in the French mail, there might be ten ; and if the fare were to be re- duced one-third, the receipts would be much larger than they are now. The profits of two years would, in that case, cover the whole expen- diture necessary in the first instance.