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Aspeed of 40 miles an hour with light load has been obtained upon the Mechan- ics lhilway; and Mr. c. Stephenson, the engineer, has stated his opinion that an en- zine might be constructed to run l00 miles within the hour; although he acknowledges thats'at that rapidity of motion the resistance of tae atmosphere would be very considera- ble.l' Engines are now made with eight times the power of the Rocket, yet with lit- tie more weight resting on each rail the load heinz equally divided upon six wheels and the machinery placed in more advanta- geous situation than formerly. The tubes of tie boiler are made smaller and more numerous, and of brass instead of copper. The last engine put on the railway ran 1000 miles with the most trival repairs, taking every day four or five journeys oi 30 miles each.- Balt. Go=.