Some very singular movements are afloat about the Hot Air project. We are keeping watch and ward over the subject, and will be able to present some strange inlormation on the subject in due season—we bide our time. By the arrival of the steamer Australia, in London, from Australia, her cargo of over $5,000,000 was received, being the largest cargo ever carried in one ship. Australia is richer in gold than California. A nugget of gold for the Queen weighed more than me quarter of a cwt. I.