CONTENTS. 



MM 



THE ORIGIN AND NATURE OF SPRINGS 1* 



CHEMISTRY OF A HEN'S EGG 18 



REBREATHED AIR 30 



CHEMISTRY OF A CIGAR 36 



CHEMISTRY OF A PINT OF KEROSENE 48 



THE LOST ARTS 61 



THE HUMAN HAIR 73 



MICHAEL FARADAY 86 



CHEMISTRY OF A LUMP OF SUGAR 90 



FARM EXPERIMENTS AT LAKESIDE 101 



WHAT SHALL WE USE FOR WATER-PIPES ? . . . .135 



THE CLOTHING WE WEAR 150 



THE RELATIONS OF WATER TO AGRICULTURE . . .156 



THE SKIN AND BATHING 186 



DIAMONDS AND DIAMOND CUTTING 193 



AMONG THE COAL MINERS 203 



CHEMISTRY OF THE HUMAN BODY 215 



ABOUT QUICKSILVER 222 



EXPERIMENTS WITH AIR FURNACES 228 



FARM PENCILLINGS AT LAKESIDE 234 



REMINISCENCES OF AN EXPERIMENTER 245 



INFECTIOUS GERMS 255 



THE FOOD OF PLANTS . . . 262 



