VUl 



PLATES 



PAGE 



Photographs illustrating- High Power Microscopy ... 12, 18, 20 



Internal Architecture of Metals .. . ... ... ... 252,257 



Health Temple at Cos 258 



How to improve Telephony ... ... ... 274,276,277 



Ptecent Progress in Magneto-Optics 



291, 292, 293, 294, 296, 297, 298, 299 



Steam Turbines on Land and at Sea 



324, 328, 329, 330, 331, 332, 333, 334 

 Studies on Charcoal and Liquid Air 



434, 438, 440, 441, 443, 445, 447 



Map of Equatorial Africa ... ... ... ... ... 731 



Studies in High Vacua and Hehum at Low Temperatures . . . 747 



