Preparations for the INDUSTRIAL EXHIBITION of 1851 continue to be made. It is stated that about L50,000 has been subscribed toward the grand Industrial Exhibition, and nearly 200 local committees formed to promote. A project has been started to connect with it a religious congress of the Christians of all nations. To questioning in Parliament, it has been answered by the Minister that no government supply was contemplated beyond the expenses of the Royal Commission. The various German Powers have united, and the Commission in London has apportioned 100,000 square feet of space to the service of the German exhibitors generally, 60,000 square feet being reserved for the States of the Zoll-Verein 30,000 for Austria, and 10,000 for the North German States and the Hanse Towns. * * * * * The transactions of the London SCIENTIFIC SOCIETIES for the month present nothing worthy of record. The Zoological Society has received a new and valuable collection of animals, and among them the first live hippopotamus ever brought to Europe.--Letters from Mr. LAYARD, who is prosecuting his researches in the East, have been received to the 18th of March, in which he mentions the Arab reports of remarkable antiquities in the desert of Khabour, which have never been visited by European footsteps, and toward the exploration of which he was just setting out, with an escort of Arab Sheiks and their followers, in all, to the number of seventy or eighty in company. During his absence on this new track, the excavations at Nimrood are to be continued by the parties employed on that work, which has recently furnished interesting acquisitions to Mr. Layard's collection. One important inscription is mentioned, and more winged-lions and bulls.