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This is the 26th Number of Volume 7 of the Scientific American-completing the half vo lume. We can send all the back numbers of the volume to new subscribers, and shall be happy to do so to as many as desire to pos sess them. We believe that no mechanic, ar tisan, inventor, or lover of useful knowledge, can be posted up on the progress of the arts and sciences, who does not take the Scientific American. The reason of this is very evi dent, it being the only paper exclusively de voted todoi:10.1038/scientificamerican03131852-205e fatcat:c3q4isn54rhyrlx6hbdrechgxy