3 volumes "The Science Library" 1971
printing, published by J.G. Ferguson Co. Chicago, Hardcover.
Filled with line drawings and color pictures. Written in a language children can easily understand and adults can easily teach to children. Excellent experiments laid out in detail. This is a superb set.
Vol-1: Beginning Science // Science Experiments // Light and Color
Vol-2: Magnets and Magnetism // Microspcope // Machines
Vol-3: Sound // Mathematics // Electricity