428 Revieus — The Italian Seismological Society. 



but irregular in shape, and make the base decagonal. Eemoval of 

 anals and Br from the radial circlet leaves a pentagonal quadripartite 

 base, such as is found in Melocrinidas. An anal resting on a tripartite 

 base is accompanied by increased width in the small 1. ant. B 

 (Fig. 4, vi). But in the bipartite base the small B fuses with the 

 combined post, and 1. post. BB, while the combined right-hand BB 

 increase in width (Fig. 4, ix). In most Dicyclica the IBB do not 

 assume a hexagonal outline ; for the anals do not occur in the 

 basal circlet, but x, when it occurs within the cup, truncates the 

 upper surface of post. B. Exceptions are Sagenocrinus, Carahocrinus, 

 and Thenarocrinus. F. A. Bather. 



{To he contimied.) 



II. — BOLLETTINO BELLA SoCIETA SiSMOLOGICA ItaLIANA. Vols. II 



and III, 1896 and 1897. 



THE Italian Seismological Society appeals to a limited circle of 

 members (there are not more than 53 altogether), but one out 

 of every three is a contributor to the last two volumes. The 

 Hollettino for these years not only reaches, but surpasses, the high 

 level attained during the first year of its publication. 



The designing and construction of earthquake instruments still 

 claim a large share of the attention of Italian seismologists ; but 

 it is a noteworthy feature of the later attempts that their object is 

 rather to improve and perfect old forms than to introduce new and 

 untried apparatus. Several of the papers belonging to this class 

 are of great value. Professor Grablovitz and Professor Ricco 

 describe the instruments at work in the geodynamic observatories 

 of Ischia and Catania respectively. Dr. Agamennone gives a full 

 account of a sensitive electric seismoscope and instructions for its 

 installation and working. Dr. Cancani describes the horizontal 

 pendulums with mechanical registration recently erected at the 

 observatory of Rocca di Papa, and, in illustration, adds the beautiful 

 records given by it of the Indian earthquake of June 12, 1897. 

 Dr. Pacher contributes a detailed study of the Vicentini micro- 

 seismograph at the University of Padua ; while Signor Arcidiacono 

 closes the wearisome controversy on the indications of the normal 

 tromometer by applying the simple test which ought to have, been 

 made long before the controversy began. 



In addition to the splendid series of records of earthquakes 

 observed in Italy (January, 1896, to June, 1897), Dr. Agamennone 

 contributes notes on earthquakes in the Epirus (Jan. 1897), the 

 Persian Gulf (Jan. 10-11, 1897), the Ionian Sea (May 28-29, 1897), 

 etc. Dr. S. A. Papavasiliou continues the catalogue of Greek 

 earthquakes formerly published in the Bulletins of the Observatory 

 of Athens ; but, whether it be due to the author's retirement from 

 the observatory or to the unfortunate war with Turkey, the number 

 of shocks recorded during the first half of 1897 is far smaller than 

 in the year before. Professor Omori investigates the decline in 

 frequency of the after-shocks of the great Japanese earthquake of 

 1854; in anotlier ])aper he shows that the mean direction of fall 

 of 245 chimneys, ttc, in Tokio during the earthquake of June 20, 



