March 7, 1913] 



SCIENCE 



373 



authors, but whose occurrence there is doubt- 

 ful, is given in an appendix, where the alleged 

 claims of each to a place in the Michigan 

 fauna are set forth. A bibliography of soma 

 twenty-five closely printed pages, a glossary of 

 technical terms, a list of contributors to the 

 work, and an index round out the volume, 

 which will take its place among the best of the 

 state ornithological manuals. 



J. A. A. 



A School Chemistry. By F. E. L. Wilson, 

 M.A., Assistant Master at Charterhouse, 

 and G. W. Hedley, M.A., Head Science 

 Master, Military and Civil Side Chelten- 

 ham College. Oxford, H. Frowde. 1912. 

 This work has been prepared to supply a 

 demand for a shorter course than the author's 

 " Elementary Chemistry." One who has com- 

 pleted the work in a satisfactory manner is 

 prepared to take the matriculation examina- 

 tions for a number of English universities. 

 The directions for work are very full and the 

 selection and arrangement of experiments are 

 excellent. Wherever possible the experiments 

 are carried out quantitatively and questions 

 and problems are introduced at the end of 

 each chapter. The use of this book by a 

 student should develop his powers of observa- 

 tion and scientific method of reasoning and 

 give him a good insight into the fundamental 

 principles of chemistry. 



J. E. G. 



Practical Chemistry for Engineering Stu- 

 dents. By A. J. Hale, B.Sc. (London), 

 with an introductory note by Professor R. 

 Meldola. London, Longmans, Green & Co. 

 1912. $1.00 net. 



Li the introductory note attention is called 

 to the fact that while chemistry is recognized 

 as necessary for engineering students, owing 

 to the short time at their disposal for this 

 subject and the lack of appreciation of its 

 value by the students themselves, the course 

 in this subject must be so arranged as to give 

 as much as possible in a short time. In order 

 to get some training in quantitative analysis 

 'they must know some general chemistry and 



qualitative analysis. Although this book is 

 intended primarily for engineering students 

 it is possible, by the selection of certain desig- 

 nated experiments, to use it in connection 

 with a course in the chemistry of building 

 materials. The experiments in general chem- 

 istry are well selected to bring out the general 

 principles of the subject, and the experiments 

 are arranged in such a manner as will bring 

 out the quantitative relations whenever pos- 

 sible. This is followed by a short course on 

 qualitative analysis and work in quantitative 

 analysis, the latter being selected to give prac- 

 tise in the preparation of standard solutions, 

 gravimetric and volumetric determinations 

 and methods of analysis of materials of special 

 importance for the engineer, such as water 

 analysis, determinations of the value of fuel, 

 furnace gases, analysis of cements and alloys. 

 While the general method here used would be 

 approved by most chemists, the necessarily 

 limited number of quantitative methods which 

 can be given would no doubt lead to a wide 

 divergence of opinion as to the ones best 

 suited for the purpose. T TT P 



Revieiu Questions and Problems in Chemistry. 



By M. S. H. Unger, A.M., Head Master, 



St. John's School, Manlius, N. Y. Ginn 



& Co. 50 cents. 



An excellent manual for use in reviewing 

 classes or formulating examination questions 

 in preparatory school work, covering as it 

 does all the material necessary for college 

 entrance or college board examinations. 



J. E. G. 



SPECIAL ARTICLES 

 THE TEMPERATURE COEFFICIENT OF THE COAGU- 

 LATION CAUSED BY ULTRAVIOLET LIGHT 



It has been pointed out in a previous paper' 

 that certain proteins coagulate when exposed 

 to ultraviolet light. In order to learn some- 

 thing about the nature of this reaction it 

 seemed desirable to investigate its temperature 

 coefficient. As photochemical reactions in 

 general are nearly independent of tempera- 



> Science, N. S., 37: 24-25, 1913. 



