23 APRIL 1921, page 20

The Einstein Theory.*

" ALL fine things are difficult," said Spinoza ; and if the diffi- culty is a measure of the fineness, to understand the Einstein theory—still more to explain it olearly—must......

The Great Munition Feat.* Taz National Effort To Supply Our

armies with munitions during the war was not less remarkable than the creation of those armies, and every one is proud of it. Mr. Dewar's spirited book on the subject, abounding......