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CRYSTALLINE STRUCTURE AND CHEMICAL CONSTITUTION. By 

 A. E. H. TuTTON, D.Sc, M.A., F.R.S. 5s. net. 



STABILITY IN AVIATION. By G. H. Bryan, Sc.D., F.R.S., Professor of 

 Mathematics in the University CoUege of Nortli Wales. 5s. net. 



STUDIES IN TERRESTRIAL MAGNETISM. By C. Chree, M.A., Sc.D., 

 LL.D., F.R.S. 5s. net. 



STUDIES IN RADIOACTIVITY. By Prof. AV. H. Bragg, F.R.S., Cavendish 

 Professor of Physics in the University of Leeds. 5s. net. 



IN THE PRESS. 



THE COTTON PLANT IN EGYPT : its Genetics, Physiology, and Economics. 

 By W. Lawrence Balls, M.A., Botanist to the Egyptian Government 

 Department of- Agriculture. 



IN PREPARATION. 



IMPROVEMENT OF WHEAT AND OTHER CEREALS. By R. H. Biffen, 

 Professor of Agricultural Botany in the University of Cambridge. 



THE ASCENT OF SAP. By Prof. H. H. Dixon, Professor of Botany in the 

 University of Dublin. 



THE ORIGIN OF ORE DEPOSITS AND THE EXTENT OF FUTURE 

 SUPPLIES. By Dr. J. W. Gregory, F.R.S., Professor of Geology in the 

 University of Glasgow. 



SOLAR RESEARCHES. By Dr. G. E. Hale, For. Mem. R.S., Director of the 

 Solar Observatory of the Carnegie Institution of AVashington. 



THE SHAPE OF THE EARTH. By Dr. A. E. H. Love, F.R.S., Sedleian 

 Professor of Natural Philosophy in the University of Oxford. 



HYDROGRAPHY OF THE NILE BASIN. By Capt. H. G. Lyons, F.R.S. 



TRYPANOSOMES AND ALLIED ORGANISMS. By Prof. E. A. AIinchin, 

 Professor of I'rotozoology in the University of London. 



WIND PRESSURE. By Dr. T. E. Stanton, National Physical Laboratory. 



RESEARCHES IN MAGNETO -OPTICS. By Dr. P. Zeeman, Professor of 

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And many others. 

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