December 21, 1900.] 



SCIENCE. 



965 



and to secure more perfect constructions and 

 more permanently valuable operation of his 

 machinery, is lamented in some of the discus- 

 sions and with good reason ; yet it is obvious 

 that this lack is entirely natural ; but it is 

 equally obvious that when the technically 

 educated and professionally trained men of the 

 coming generation, now just issuing from the 

 technical and professional schools, to take the 

 lead in the work of the industries of all de- 

 partments, shall have reached their period of 

 maturity and of maximum usefulness, this dif- 

 ficulty is likely largely to disappear. In fact, 

 the technical papers of the time are coming to 

 more and more illustrate the literary, as well 

 as professional powers of this class. 



The illustrations are all well-made, some 

 half-tone, others engraved, many diagram- 

 matic, and constitute a most important feature 

 of the volume. The book-making is excellent 

 and the whole may be taken as among the best, 

 if not itself the very best, of illustrations of 

 the character of the work of the contemporary 

 man of science in these departments of appli- 

 cation. The mechanic and engineer of ,to-day 

 is the maker of the modern material world 

 and it gives the average citizen of every civil- 

 ized country a feeling of satisfaction and of 

 safety to find that he is at once ' practical ' and 

 scientific, experienced and learned, competent 

 to unite the best of scientific knowledge with 

 the richest of technical experience in the de- 

 sign, the construction and the operation of the 

 machinery of the world and in thus building 

 the foundations of our civilization broad and 

 deep and solid. This volume has large signifi- 

 cance from the point of view of the economist, 

 the educator, the philosopher and the states- 

 man, as well as from that of the technicist and 

 the engineer. 



Its editor, the secretary, deserves cordial 



congratulations. 



R. H. Thurston. 



BOOKS EECEIVED. 



Elementary Anatomy, Physiology and Hygiene. Win- 

 field S. Hall. New York, Cincinnati and Chi- 

 cago, American Book Company. 1900. Pp. 273. 

 75 cents. 



Life and Letters of Thomas Henry Huxley. Leonard 

 Huxley. New York, D. Appleton & Company. 



1900. Vol. I. Pp. xi-f 539. Vol. II. Pp. vii 

 -t-541. 



TJte Limitation of Learning and other Science Papers. 

 Albert Schneider. Chicago, Chicago Medical 

 Book Company. 1900. Pp. 100. 



Text-book of the Embryology of Invertebrates. E. KOR- 

 SCHELT and K. Heidbe. New York, The Macmil- 

 lan Company. London, Swan Sonnenschein and 

 Company. 1900. Vol. IV. Pp. xi + 594. 18s. 



One Thousand Problems in Physics. WILLIAM H. 

 Snyder and Irving O. Palmer. Boston, Ginn 

 & Company. 1900. Pp. t + 142. 



An Elementary Treatise on Qualitative Chemical Analy- 

 sis. J. F. Sellers. Boston, Ginn & Company. 

 1900. Pp. ix -f 160. 



The Progress of Invention in the Nineteenth Century. 

 Edward W. Bryn. New York, Munn & Com- 

 pany. 1900. Pp. viii -I- 476. $3.00. 



Die Erdstrome im deutschen Beichstelegraphengebiet und 

 ihr Zusammenhang mil den Erdmagnetischen Er- 

 scheinungen. B.Wbinstein. Braunschweig, Fried- 

 rich Vieweg und Sohn. 1900. Pp. vi -|- 78 and 

 19 plates. 



Tlieoretische Betrachungen iiber die Ergebnisse der wis- 

 senschaftlichen Luftfahrten. Wilhelm VON Be- 

 zold. Brunschweig, Friedrich Viewig und Sohn. 

 1900. Pp. 31. 



tjber 3Iuseen des Ostens der Vereinigten Staaten von 

 Nord Amerika. A. B. Meyer. Berlin, R. Fried- 

 lander und Sohn, 1900. Pp. viii -|- 72. 



Tlie Biography of a Baby. Millicent Washburn 

 Shinn. Boston and New York, Houghton, Mifflin 

 &Co. 1900. Pp.246. $1.50. 



A Reader in Physical Geography. ElCHARD Elwood 

 Dodge. New York, London and Bombay. Long- 

 mans, Green & Company. 1900. Pp. ix -\- 231. 



SOCIETIES AND ACADEMIES. 

 BIOLOGICAL SOCIETY OF WASHINGTON. 



The 329th meeting was held on Saturday 

 evening, December 1st. 



L. Stejneger presented a paper 'On Post- 

 Pliocene Migrations of Siberian Animals into 

 Europe,' saying that three invasions of Siberian 

 higher vertebrates into western Europe are dis- 

 tinguishable since Pleistocene times. The first 

 one took place before the maximum glaciation 

 of the ice age, at a time when Ireland and Nor- 

 way were both connected with Great Britain, 



