We have had positive news of the signature of ihe treaty between the United States and Mexico, but are entirely m the dark as to its contents. The most curious and extravagant surmises aie made, some pretending thai 10,000 troops will be sent to Vera Crux short ly, tor the purpose of invading the country : others, that ihe Government oi the United State* will ,-ect.re the ports to the Liberal