Tin 370 block 371 compounds 372 crystals 372 family 370 foil 371 metallurgy 370 plate 371 properties 371 uses 371 Titanium 257, 264 Topaz 331 Triad families 166 Tungsten 388 Type metal 253, 375 Uranium 388 Valence 116 a numerical property 116 and combining ratios 118 and equations 120 and formulas 120 and periodic groups 162 and structure 118 definition 116 indirectly determined 117 measure of 117 variable 117 Vaseline 400 Venetian red 349 Verdigris 407 Vermilion 363 Vinegar 406 Vitriol, blue 361 green 350 oil of 154 white 324 Volume and aqueous tension 25 and pressure 24 and temperature 23 of combining gases 194 Water 40 a compound 40 and disease 49 catalytic action of 154 chalybeate 351 chemical properties 53 composition 47 composition by volume 44 composition by weight 47 dissociation of 210 distillation of 50 electrolysis of 41, 103 filtration of 51 gas 219 hard 309 historical 40 impurities in 48 in air 87 mineral 49 occurrence 48 of crystallization 54, 75 physical properties 53 purification of 50 qualitative analysis 41 quantitative analysis 42 river 49 sanitary analysis 50 self-purification 53 softening of 310 standard substance 55 synthesis 43 uses of 55 Weights, atomic 65 Welsbach mantles 219, 377 Whisky 404 Wine 404 Witherite 312 Wood alcohol 402 distillation 402 Wood's metal 254 Xenon 80 Yeast 403 Zinc 321 alloys of 323 blende 321 chloride 325 flowers of 322 metallurgy 321 occurrence 321 oxide 324 sulphate 324 sulphide 325 white 324 Zymase, 403 ANNOUNCEMENTS AN ELEMENTARY STUDY OF CHEMISTRY By WILLIAM McPHERSON, Professor of Chemistry in Ohio State University, and WILLIAM E. HENDERSON, Associate Professor of Chemistry in Ohio State University. 12mo. Cloth. 434 pages. Illustrated. List price, $1.25; mailing price, $1.40 This book is the outgrowth of many years of experience in the teaching of elementary chemistry. In its preparation the authors have steadfastly kept in mind the limitations of the student to whom chemistry is a new science. They have endeavored to present the subject in a clear, well-graded way, passing in a natural and logical manner from principles which are readily understood to those which are more difficult to grasp. The language is simple and as free as possible from unusual and technical phrases. Those which are unavoidable are carefully defined. The outline is made very plain, and the paragraphing is designed to be of real assistance to the student in his reading.