7 APRIL 1923, Page 22

Seientia. (London : Williams and Norgate.)

Scientia is an excellent magazine. It contains scientific papers in French, Italian and English. Though these papers give the results of serious research and must be of value to specialists, they are not so technical as to be incomprehensible to an alert-minded amateur. In the March issue there are no papers in Italian and only one in English, but the English paper is the most notably attractive of all. In it Mr. J. H. Jeans discusses the various theories of the planes, directions and limits of star-streaming ; his conclusion is that the motions of stars are best compared to the motions of intermingling swarms of bees. Signor Castelnuovo argues in a French paper that the Space-Time assumed by Relativists is not a •

mere useful supposition (in fact, is ,not relative), but corre- sponds to 'a reality of which we were, until recently, unaware. The inclusion of this paper is a sign of the impartiality of the editor, Signor Rignano ; his own view is the Opposite of Signor Castelnuovo's.