Scientific American Volume 77 Number 07 (August 1897) . ing septicemia, but microscopic examination provesthat the HI effects are due to the liability of ink to con-tain pathogenic bacteria. Dr. Marpmann, of Leipsic,has recently published the results of the microscopicexamination of sixty-seven samples of ink used inschools. Most of them were made with gall nuts, andcontained saprophytes, bacteria, and micrococci. Nig-rosin ink, taken from a freshly opened bottle, wasfound to contain both saprophytes and bacteria. Redand blue ink also yielded numerous bacteria. In two instances Dr. Marpmann su
Scientific American Volume 77 Number 07 (August 1897) . ing septicemia, but microscopic examination provesthat the HI effects are due to the liability of ink to con-tain pathogenic bacteria. Dr. Marpmann, of Leipsic,has recently published the results of the microscopicexamination of sixty-seven samples of ink used inschools. Most of them were made with gall nuts, andcontained saprophytes, bacteria, and micrococci. Nig-rosin ink, taken from a freshly opened bottle, wasfound to contain both saprophytes and bacteria. Redand blue ink also yielded numerous bacteria. In two instances Dr. Marpmann succeeded in cultivating fromnlgrosln ink a bacillus which proved fatal to micewithin four days. This ink had stood in an openbottle for three months, and the Inference to be drawnfrom the inquiry is that ink used inschools shouldalways be kept covered when not in use. The practiceof moistening the pen with the tongue is likewise adangerous one. ^ I • I » The Bertlllon System for Identifying Criminals. H. P. Flower, Mayor of New Orleans, who has been. VAN DEPOELE UNDER-RUNNING TROLLEY. to Paris to study the Bertlllon system for the identifi-cation of criminals, has just returned. He said that,through the kindness of M. Bertlllon, he had had anopportunity to master the system, which will be adopt-ed by the Police Department of New Orleans. Themayor will teach the system to the police system was described in the Scientific Ameri-can for April 8, 1897. massive blocks of concrete upon a suitable bed at lowtide, and transport them suspended beneath a scow athigh tide to the site of the work. The system herewith Illustrated, and which is pro-tected by patents, differs entirely from the foregoingand possesses some points of practical advantage whichwill commend themselves to the engineer. Unlike theothers, the whole of the sea wall, pier or bulkhead isbuilt upon a platform suspended above the level ofthe water, and lowered as it is built until it rests uponthe bottom of
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