The French savans are not content with saying this. They are very indignant at Wroblewski stealing Cailletet’s crown just as it was going to be placed on the Frenchman’s head. It was sharp practice, for all that a scientific discoverer has to look to is the fame which he wins among men. The Academy took no notice of the interloping Poles, but awarded to Cailletet the Lacaze Prize, their secretary, M. Dumas, then lying sick at Cannes, expressing their opinion in the last letter he ever wrote. “It is Cailletet’s apparatus,” says M. Dumas, “which enabled the others to do what he was on the point of accomplishing. He, therefore, deserves the credit of invention; the others are merely clever and successful manipulators. What has been done is a great fact in the history of science, and it will link the name of Cailletet with those of Lavoisier and Faraday,” So far M. Dumas, who might, one fancies, have said something for Pictet, only a fortnight behind Cailletet in the experiment which practically liquefied oxygen. His case is quite different from Wroblewski’s, for he and Cailletet had been working quite independently, just as Leverrier and Adams had been when both discovered the new planet Neptune. Such coincidences so often happen when the minds of men are turned to the same subject. Well, the scientific world is satisfied now that the elements of air can be liquefied; but I want to see the air itself liquefied, as what it is—a mechanical, not a chemical compound. For from such liquefaction, one foresees a great many useful results. You might carry your air about with you to the bottom of mines or up in balloons; you might even, perhaps, store up enough by-and-by to last for a voyage to the moon.—_All the Year Round._ THE HEALTH AND LONGEVITY OF THE JEWS. BY P. KIRKPATRICK PICARD, M.D., M.R.C.S.