M. De Luc, in his Idées sur la Météorologie, has made some objections to the Theory of Rain which I had the honour to lay before this Society. I shall now endeavour to answer these objections; and hope the Society will forgive me for taking up a little of their time and attention with this subject. The reputation of M. de Luc is so well established in the republic of letters, that I must not neglect remarks which have the fanction of such authority; although, in the present case, they appear to me to have come from a judge who was too much preoccupied with a different system.