acid, but is certainly distinct from it. ward position conceivable. For the convenience of sages, A, in the valve- In a second communication, M. Simon describes some street-railway passengers the avenue lamp-posts in later work “with . the same compound. The acid, to holder. The upper cyl- New York… … cylinder by means of the valve-holder and the suction- tinct and is well marked in both directions. The acid chamber. During the dowastroke of the upper plunger may be used to advantage to show the presence of A NEW STREET SIGN FOR LAMP-POSTS. the water previously drawn into the lower end of ferric…
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