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1) Description of Paul Haenlein's Ballon Locomotive. The great failures which have further attended the various attempts & suggestions to navigate the air, are chiefly due to an insufficient knowledge of the properties of this Element & to an erreonous judgment of the prime movers & contrivances adapted for propulsion. Attempts have been made as early as 70 years ago to propell [[propel]] the balloon by means of molecular force but failed entirely. The application of steam has likewise been suggested but no experiments in which it has been made use of are on record. With the limited recourses then at our disposal, the subject in question had almost been abandoned as an insoluble one. Fortunately however there has been added to the number of prime movers, Lenair's gas engine, which, by its very nature seems to combine all the requisites & properties necessary for the motion of balloons. By the adaption of the gas engine the carriage of steam boiler, water, fuel etc, is entirely dispensed