REVIEWS 197 



SiEGMUND SziRTES. " Seismogramme des japanischen Erdbebens 



am 21. Januar 1906," Veroffentl. des Zentralhureaus der intern. 



Seismolog. Assoz., Serie A, Abhandl., Strassburg, 1909, pp. 



1-50; 2 maps and 7 pis. of seismograms. 

 SiEGMUND SziRTES. " Unifilares Horizontalpendel," ibid., 1909, 



pp. 1-2 1 ; 2 pis. 

 C. Mainka. "Eine neue seismische Untersuchungsplatte " (Teil 



I), ihid., 1909, pp. 1-37; 3 pis. 

 Seigmund SziRTES. "Katalog der im Jahre 1905, registrierten 



seismischen Storungen" (I Teil), ibid., Kataloge, 1909, pp. 



1-193; I map. 

 Adolf Christensen et Georg Ziemendorff. "Les tremblements 



de terre ressentis pendant I'annee 1905, ibid., 1909," pp. 1-543; 



21 text-maps and a world-map. 



The above-listed publications issued from the Central Bureau of the 

 International Seismological Association show what is being accomplished 

 with the funds subscribed by the different contributing governments. The 

 world-catalogue of earthquakes is alone a stupendous undertaking sure 

 to furnish future seismologists with the data for broad and safe generali- 

 zations. The bulky volume covering the year 1905 is in two parts, one 

 chronological in its arrangement, while in the other the earthquakes are 

 arranged chronologically under each of twenty more or less arbitrarily 

 chosen earthquake provinces. The maps which show the distribution 

 of the quakes of 1905 are of especial interest and value. 



One of the memoirs discusses a new seismograph of fairly simple con- 

 struction which has been devised by Dr. Szirtes with the purpose of obviat- 

 ing defects which an extensive comparative study has shown to be common 

 to many of the types now in use. Dr. Mainka's "New Seismic Testing 

 Plate" is intended for use in testing seismographic apparatus of a wide 

 range of design. Incidently, it may be mentioned, the plates of the paper 

 give much the best representations of the Mainka Bifilar Conical Pendulum 

 (a form now widely introduced in Germany) that have thus far appeared. 

 Szirtes' monograph on the Japanese earthquake of January 21, 1906, 

 differs widely from the ordinary earthquake report, in that an attempt 

 has been made to bring the instrumental data into some relation to topog- 

 raphy and geology. A graded intensity map of Japan shows a somewhat 

 remarkable resemblance to the interesting geognostic map of Japan by 

 the late Baron v. Richthofen. As a result of his study, Szirtes states the 



