During the investigation of the action of torpedoes the use of photography was also largely brought into requisition by the writer in order to ascertain the work that was expended by different charges of gun cotton. The method adopted was roughly this: A mine having been laid down at a known depth and position in water, a scale was placed over it, and photographed from the position the camera was to occupy. On the explosion of the gun-cotton or powder an instantaneous exposure was given to a specially sensitive plate, and the height, breadth, and general form of the resulting column of water was obtained from the photograph after comparing it with the photographic scale. At Shoeburyness, again, a regular staff of photographers is kept in order to photograph all the experimental work carried on by the artillery against iron shields, &c., and the series of such pictures has been able to convey more to the minds of committees than elaborate drawings could do. We can not conclude these applications of photography without recalling the fact that it has proved exceedingly useful in the repression of crime. The portrait of every convict is taken by an authorized photographer in each convict establishment, and when necessity arises prints from such negatives are produced by the hundred and distributed, in order that the various police authorities may be enabled to identify a criminal who may have happened previously to be placed under their surveillance. DANIEL WEBSTER versus STEPHEN GIRARD. The true relation of Christianity to education has seldom, if ever but once, been before the Supreme Court of the United States for adjustment. That time was when Daniel Webster made his great argument to break the will by which Mr. Girard founded his college in Philadelphia. Mr. Webster rose to the demands of his opportunity, and made what was at once a masterly argument for his cause, and a splendid defense of Christian charity, Christianity, and the Christian ministry. In the following article we have abridged his speech, but we have tried to preserve the chain of his argument. It is wholesome reading from the mind of America’s greatest constitutional lawyer, in the times when rhetoricians hurl flippant statements against the bulwarks of divine truth, as though with these they would batter them down. Two millions of dollars were bequeathed by Mr. Girard for the erection of a college; detailed plans were drawn specifying where, how, and for whom it was to be built. The validity of this will was contested by the heirs-at-law in 1836. In 1841 the case was carried to the Supreme Court of the United States. In course of the argument, Daniel Webster made the speech of which we give a synopsis. We follow the argument, giving only brief quotations. Mr. Webster passes over the details of the will, taking up the following clause, or restriction, which Mr. Girard prescribed as among the conditions on which his bequest for the college was to be enjoyed.