SCIENCE— ADVERTISEMENTS 



The Boreal Flora 



of the 



Sierra Nevada of California 



By FRANK JASON SMILEY 



423 pages, 7 plates. Paper, $5.00. Carriage 

 extra, weight 2% lbs. 



This book constitutes a working flora 

 of the high Sierra Nevada of California. 

 It has been the intent of the author to 

 present a list of all the plants of the 

 high Sierra with keys for their determi- 

 nation. He has also included descrip- 

 tions of the geology, topography, and 

 climate of the range. 



University of California Press 



Berkeley, California 



PUBUCATIONS OF 

 CARNEGIE INSTITUTION OF WASHINGTON 



85. Hasse, Adelaide R. Index of Economic 

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 the United States. Quarto. 



(Pennsylvania) (1790-1904), Part I. A to E, pp 1-810. 89.00 



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Part III, Rainfall to Z In preis 



275. Contributions to Embryology, No. 56. Vol. 

 XII. Quarto. 



Maix, F. p., and A. W. Meyeb. — Studies on Abortuses: A Survey 

 of the Pathologic Ova in the Carnegie Embryological Collection. 

 364 pp., 24 plates, 6 figs 86.00 



299. Burnett, E. C. Letters of Members of the 

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Vol. I: August 29, 1774, to July 4, 1776. LXVI+572 pages-.SS.OO 

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30S. CannoNj W. a. Plant Habits and Habitats 

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Octavo, VIII+139 pages, 32 pis., 31 figs 82.75 



313. Hall, Harvey M., and Frances L. Long. 

 Rubber-content of North American Plants. 



Octavo, 65 pages, 3 plates 81.00 



314. Loftfield^ J. V. G. The Behavior of Sto- 

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Octavo, 104. pp., 16 pis., 54 figs. 81.50 



315. Clements, F. E. Aeration and Air-content: 

 The Role of Oxygen in Root Activity. 



Octavo, 183 pages $2.00 



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Books for Public Health Officials 



PUBLIC HEALTH SURVEYS 



What They Are, How to Make Them, How to Use Them. 



By Murray P. Horwood, Ph.D., Instructor in Biology and Public Health, Massachusetts 

 Institute of Technology. With a Foreword by the late William T. Sedgwick, and an In- 

 troduction by George C. Whipple. 



A dependable guide to all those who contemplate making public health surveys, giving 

 the problems and difficulties which rise during the progress of such work, with practical sug- 

 gestions for their solution. 



403 pages. 4% by 7. 95 figures. Flexibly bound. $4.50 postpaid. 



MORTALITY LAWS AND STATISTICS 

 By Robert Henderson, Actuary of the 

 Equitable Life Assurance Society of the 

 United States. 



Sets forth the essential facts and theoreti- 

 cal relations in reference to the duration of 

 human life. 



Ill pages. 6 by 9. 3 diagrams. Cloth, 

 $1.50. 



VITAL STATISTICS 

 By George Chandler Whipple, Profes- 

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 versity. 



A guide to the study of this subject, 

 written for students who are preparing 

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517 pages. 4% by 6%. 63 figures. Flexi- 

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