224 



SCIENCE 



[N. S. Vol. XXXI. No. 7f 



variations, theory of functions, elliptic func- 

 tions, geometry and trigonometry, analytic 

 geometry of plane and space, differential 

 geometry, probabilities, calculus of errors, 

 quaternions and vector analysis. Under each 

 of these and other topics is a brief summary 

 of the subject, often containing items that are 

 not elsewhere so easily found. 



Mechanics and Physics cover a wide range : 

 Lagrange's equations, spherical harmonics, 

 graphical statics, work and energy, hydrody- 

 namics, elasticity, heat, sound, light, electric 

 units, laws and measurements, electromagnet- 

 ism, induction, hysteresis. Maxwell's theory, 

 etc. ISTumerous tables accompany the text. 



In arrangement and style the " Taschen- 

 buch " reminds one of Pascal's " Repertorium 

 of Higher Mathematics." It is, however, only 

 about one third as large, and in mathematical 

 content only one ninth. All references have 

 been excluded under the heavy compression. 

 But every mathematician and physicist will 

 find it a useful book to have about, for it will 

 often save searching through a library for an 

 elusive item. F. N. Cole 



Vergleichende Anatomie der Wirheltiere. Dr. 



Egbert Wiedersheim. Seventh edition. 



Pp. 936, 476 figures, one plate. Jena, 



Gustav Fischer. 1909. 



The rapid growth of this book, which now 

 contains nearly a thousand pages and costs 

 between five and six dollars, has transformed 

 it from a text-book into a reference work. As 

 such it will without doubt be as indispensable 

 as in previous editions. It retains, however, 

 much the same character as before. 



It is pleasing to an American to note the 

 large recognition of American work, but one 

 regrets that in one or more instances the facts 

 are recorded in footnotes only. 



The text is brought up to date by the addi- 

 tion of new material on almost every page 

 and certain sections are essentially rewritten, 

 as for example, the discussion of the lym- 

 phatic system, which is more than twice as 

 large as before. The chapter upon the skull 

 has grown the most owing to a large degree 

 to the introduction of more figures of chon- 



drocrania. The section upon myology ought, 

 it seems to the writer, to have received more 

 attention than it has had. The subsection 

 upon the electrical organs certainly ought to 

 have been rewritten so as to embody recent 

 discoveries. The sections upon the central 

 nervous system, sense organs and the respira- 

 tory system have expanded about equally. 

 The discussion of the peripheral nervous sys- 

 tem is but slightly longer, but it has been 

 largely rewritten and is greatly improved. 



The sixty new figures are well chosen. A 

 considerable number of illustrations which 

 have appeared in several editions could well 

 be dispensed with, and the printing of many 

 of the old figures in colors has added little if 

 at all to the usefulness or beauty of the book. 



The bibliography has been thoroughly re- 

 vised, a very large number of new titles have 

 been added, and, owing to the omission of 

 many of the older or less important titles, 

 there has been only a small increase in size. 



This edition can be heartily commended. 

 Leonard W. Williams 



Lectures on the Experimental Psychology of 

 the Thought-Processes. By Edward Bead- 

 ford TiTCHENEE. ISTew York, The Macmil- 

 lan Company. 1909. Pp. xi + 318. 

 In these lectures, originally delivered at the 

 University of Illinois in the spring of 1909, 

 and now published with an appendix contain- 

 ing valuable notes and references. Professor 

 Titchener presents a resume and criticism of 

 a much-debated recent development in experi- 

 mental psychology — an attempt to extend the 

 experimental method to the processes of think- 

 ing. The extended series of articles which are 

 chiefly considered — though contributions by 

 other psychologists receive due notice — have 

 emanated from the pupils and colleagues of 

 Professor Kiilpe at Wiirzburg. The principal 

 names are Marbe, "Watt, Ach, Messer and 

 Biihler, and the dates run from 1901 to 1908. 

 Many other writers, whose work or views bear 

 on the problem, are considered in the notes or 

 in the two introductory lectures. 



The early experimental psychologists con- 

 sidered the higher intellectual processes too 



