13 
PAUK 
Lynge, Bernt -^-Lichens f rom, the Gj0a Expedition 92 
Rietz, G. Einar du — Swedish Xantliorix .. .. 92 
Lynge, Bernt — Studies of the Lichen Flora of Norway 93 
Mycetozoa. 
Lister, A . — Arcyria virescens, sp.n 93 
MICROSCOPY. 
Reeyes, Prentice — The Reaction of the Eye to Light 94 
Morey, George W . — Classification and Nomenclature of Optical Glass 94 
Adams, L. H., & G. D. Williamson— A Note on the Annealing of Optical Glass .. 94 
Bowen, N. L . — Optical Properties of Anthophyllite .. .. 94 
Wright, F. E. — Dispersion in Optical Glasses 94 
„ „ — Certain Relations between Chemical Composition and Refractivity 
in Optical Glasses 94 
Day, Arthur L . — Optical Glass and its Future as an American Industry .. .. 94 
French, James Weir — The Unaided Eye. Part Ilf 94 
Walls, Robert R . — The Rock-Crystal of Brazil 94 
METALLOGRAPHY. 
Portevin, A. M . — Constitution of Tungsten ond Molybdenum Steels 94 
„ „ & Y. Bernard — Coalescence in Steels 95 
Dupuy, E. L . — Mechanical Properties of* Steels at High Temperatures 95 
Belaiew, N. T . — Damascene Steel 95 
Yam ada, K . — Magnetic Separation of the Lines of Iron, Nickel and Zinc in Different 
Fields 95 
Takahashi, Y . — Magnetic Separations of Iron Lines in Different Fields.. .. 95 
Thain, W. A. — Electro-deposition in Aeronautical Engineering 96 
Mason, F . — Maximum Current Density in Silverplating 96 
Archbutt, L . — Failure of Lead Sheathing of Electric Cables 96 
Fowler, H . — Fractures in Locomotive Boiler Tubes 96 
Hanson, D . — Intercrystalline Fracture in Steel 96 
Jones, J. A . — Inter crystalline Cracking of Mild Steel in Salt Solutions 96 
Hatfield, W. H . — Mechanism of Failure of Metals from Internal Stress .. .. 96 
Humfrey, J. C. W . — Internal Structure in Relation to Microstructure 97 
Rawdon, £f. S . — Internal Fracture in Steel Rails 97 
Greenwood, J. N . — Internal Stress Irregularities 97 
ULTRAMICROSCOPY, COLLOIDS,’ Etc. 
Svedberg, The — Physics and Chemistry of Colloids 97 
Bhatnagar, S. S . — Reversal of Phases in Emulsions 97 
Bradford, S. C . — Reversible Sol-gel Transformation 98 
Barratt, J. O. W. — The Structure of Gels 98 
Willows, R. S . — Precipitation of Disperse Systems 98 
Lowndes, A. G . — Abnormal Crystallization of Lead Azide by Protective Colloids . . 98 
Hughes, W. E . — Colloids in Electro-deposition of Metals 98 
NOTICES OF NEW BOOKS. 
Burton, E. F . — The Physical Properties of Colloidal Solution s 99 
Beilby, Sir George — Aggregation and Flow of Solids 99 
