The nature of matter and electricity is excellently discussed in several books of a popular variety. The very best and most complete of its kind that has come to the author’s attention is Comstock and Troland’s The Nature of Matter and Electricity (D. Van Nostrand Co., 1919). Two other very readable books are Soddy’s Matter and Energy (Henry Holt and Co.) and Crehore’s The Mystery of Matter and Energy (D. Van Nostrand Co., 1917).
ALBERT EINSTEIN
C. Wide World