[ 817 ] 



LXXIX. Notices respecting Stic Books. 



PhysxJcalisch.es PraJctikum. Von Eilhaed "Wiedemann und 

 Hermann Ebert. Fiinfte Verbesserte und Vermehrte Auflage. 

 Mit 360 eingedruckten Abbildungen. Braunschweig : P. Vieweg 

 und Sohn. ^ 1904. Pp. xxx+590. 



r PIIE fifth edition of this well-known text-book differs but little 

 -*- from its predecessor. Among the additions, we may note the 

 determination or the critical temperature, the measurement of 

 specific heats by means of the ice-calorimeter, the determination 

 of the calorific value of a fuel, the efficiency test of a shunt-wound 

 motor and dynamo, and the determination of their characteristic 

 curws. Very few elementary text-books on practical physics can 

 rival in completeness and clearness the excellent laboratory guide 

 provided by Messrs. AViedemann and Ebert, and we can heartily 

 commend it to teachers and students alike. 



EUhtrizitdt and Materie. Von Dr. J. J. Thomson, F.R.S., Professor 

 der Experimentalphysik an der Universitat in Cambridge. 

 Autorisierte Ubersetzung von Gr. Siebert. ZNJit 19 einge- 

 druckten Abbildungen. Brauuschweig : P. Yieweg und Sohn. 

 1904. Pp. viii + 100. 



The latest addition to the timely series of monographs at present 

 being issued by the well-known publishing firm of Messrs. Yieweg, 

 and entitled 'Die Wissenschaft,' is a translation of Prof. J. J. 

 Thomsons well-known Silliman Lectures on "Electricity and 

 Matter."' The absorbing interest of the bold and profoundly 

 original speculations contained in this volume is sure to secure for 

 it a wide and appreciative circle of Grerman readers. The trans- 

 lation lias been carried out with great care, and is in every way 

 a faithful rendering of the original. 



LXXX. Proceedings of Learned Societies. 

 GEOLOGICAL SOCIETY. 

 [Continued from p. 620.] 



March 8th, 1905.— J. E. Marr, Sc.D., F.R.S., President, 

 in the Chair. 



r PHE following communications were read : — 



1. ' Observations on some of the Loxonematidae, with Descrip- 

 tions of two New Species.' By Miss Jane Donald. 



i'. • On some Gasteropoda from the Silurian Rocks of Lkmgadock 

 (Caerniarthenshire).' By Miss Jane Donald. 



