the French is the language of general intercourse among nations, and as a depository of human Science is unsurpassed by any other language living or dead:
I'm actually unsure if I understand this sentence completely, but from what I am gleaning is quite surprising. "French is the language of general intercourse among nations." I didn't quite realize how many people spoke French for such a statement to be made, how popular it was (but that it was also "unsurpassed by any other language living or dead"). I would presume Latin to be of high importance, although dead, has many words derived from it. Latin was a foundation for meaning and language, but how does French compare? I do know that TJ was quite a popular diplomat when it came to the French, which is the only explanation I can come up with for such high admirations displayed here.