Loomis discusses the subject at length, and his chief objection may be summed up as follows: According to Sawyer &, Co.'s own data, _the centrifugal force of a revolving wheel exceeds the power required to produce the rotation only at exceedingly high velocities--and in order to avail themselves of the full extent of this centrifugal force, they must employ air of such density that no vessel could possibly resist its pressure_. * * * * * In the archives of Venice an interesting discovery has been made, from which it would appear that a Frenchman of the name of Gautier, professor of mathematics at Nancy, and member of the Royal Society at Paris, was the first to invent navigation by steam. In the year 1756 he submitted his plan to the society, of which he was a member, and it met with no countenance from that body. He then published a treatise on the subject, which attracted the attention of the Venetian Republic, and procured for him an invitation to the shores of the Adriatic; he went, but death soon put an end to his labors. A year or two afterwards the theory of Gautier was practically exemplified on the Seine, amidst the acclamations of the Parisians. The treatise by Gautier on "Navigation by Fire" the discovery alluded to above. * * * * * A paper was read before the British Association entitled "A Comparison of Athletic Men of Great Britain with Greek Statues," by Mr. J. B. Brent. Mr. Brent, in order to obtain those of the athletic, measured and weighed celebrated boxers, cricketers, wrestlers, rowers, pedestrians, and others. These he compared to the heights and weights of soldiers and policemen, and thence with certain celebrated Greek statues. And from such a comparison it appears that the wrestlers of Cornwall, Devon, and the north of England, are not inferior to those statues. * * * * * A letter from St. Petersburg says that the _Geographical Society_ of that city is displaying great activity. "Scarcely has the expedition which is sent to seek out the sources of the Nile returned when the society is preparing a new expedition having for its object to explore the peninsula of Kamskatka. The Count de Czapski is to have the direction of this new attempt, and he has subscribed 20,000f. a year towards the expense." * * * * *