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MM. Chanoz and Perrigot have been attempting to repeat an experiment made by M. Bordier, who showed that N-rays emitted by tempered steel could apparently be detected by photography. The former, however, found that equal sized pieces of steel and of lead, placed on exactly similar screens, and exposed for various periods, never gave different halos, as described by M. Bordier. In June, 1903, the English Astronomer Royal pub lished the statement that there was a discrepancy in the determination of the longitude between the Green wich and Paris observatories. It was also stated that independent, though simultaneous, observations to recti fy this error were to be undertaken by two observers in France. This work has now been completed, and at a recent meeting of the Paris Academy of Sci ences, M. Loewy, director of the National Observatory, exhibited the results of the French observers. This is in remarkable accord with the results of the Eng lish observers. The difference only amounts to three hundredths of a second, being in actual figures 9 min utes 20.974 seconds. From this it is deduced that Paris stands on a meridian which is east of the merid ian of Greenwich, and that its noon is this amount in advance of that of Greenwich. The results of these observations, and their close, agreement with the previ ous work carried out for this purpose in 1888 and 1892, testify to the commendable exactitude of the operations of both the English and French astronomers. Accord ing to M. Loewy, the results of this last investigation establish precisely and definitely the difference of longi tude between the two fundamental meridians of the respective observatories.
