328 MESSES. G. A. J. COLE AND J. W. GREGOKY 



included under this name. Thus, according to Valmont de Bomare *, 

 some of the specimens of West-Indian " Gamaicu " are pieces 

 of madrepore ; possibly it has an oolitic structure. A second group 

 that must be removed is a series of hornbleudie and actinolitic 

 schists ; such are the variolites of the Varaita and Upper Po 

 valleys described by Gastaldi f, those from the Pellice valley near 

 Turin +, and the variolitic hornblende-schists of Transylvania §. 

 The third group to be removed are those amygdaloids known as the 

 " variolites of the Drac " || ; they were rightly regarded as volcanic 

 by Lamanon% who, having been persuaded by Paujas and others 

 that he was wrong, destroyed all but twelve copies of his work. 

 Brongniart ** has described from Pietra mala, and Mattirolo ft from 

 Pria Borgheise, other variolites that are apparently amygdaloids ; 

 in the latter case the rock contains globules of calcite and chlorite, 

 without radial structure. 



In most of the localities from which true variolite has been 

 recorded only pebbles of it have been found, and these may be 

 summarily dismissed as likely to throw little or no additional light 

 upon the nature of the rock. Such are the pebbles at Le Chatelard, 

 in Savoy XX 5 iii the Emmenthal, in Switzerland §§ ; at Hausdorf and 

 other localities in Silesia ||||; in the Eemigiusberg, near Cusel in 

 Bavaria 1[1[ ; in the valley of the Inn, at Braunau ***. In Italy 

 they have been discovered at Chaumont near Susa fft, at Penes- 

 trelles *, ExiUes ttti Prejus §§§, Sestri near Genoa *, Monte Catini 

 near Yolterra *, near Pietra Mala *, the Dora near Turin ||||||, Ses- 

 trieres HHH, near Monte Viso ****, &c. In the collection of the 

 Normal School of Science and Royal School of Mines there is a 



* Valmont de Bomare, ' Dictionuaire raisonne universal d'Histoire Natu- 

 relle/ t. viii. Lyon (1791), pp. 272-4. 



t B. Gastaldi, Boll. Com. geol. Italia, vol. vii. (1876) p. 106. 



X Geinitz, Tsch. Min. u. petr. Mitth., Neue Folge, Bd. i. (1878) p. 152. 



§ F. von Hauer and Guido Stache, ' Geologie Siebenbiirgens,' Wien, 1863, 

 p. 209. 



II Gueymard, Ann. Mines, ser. 4, t. xviii. (1850) pp. 41-59 



^ De Lamanon, ' Memoire Litho-Geologiqiie sur la vallee du Champsaur et 

 la montagne de Drouvaire dans le Haut Dauphine,' Paris, 1784. 



** A. Brongniart, Ann. Mines, vol. vi. (1821) p. 198, pi. i. fig. 4. 



ft E. Mattirolo, Rend. Accad. Lincei, Eoma, ser. 4, vol. ii. pt. i. (1886) p. 646. 



II P. L. A. Cordier and Ch. d'Orbigny, ' Description des Roches,' Paris, 1868, 

 p. 165. 



§§ Longius, l. c. ; J. P. Kaufmann, Beitr. z. geol. Karte Schweiz, xi. 1872, 

 p. 375. 



II II E. Datbe, Jahrb. d, k. preuss. geol. Landesanst. fiir 1882 (Berlin, 1883), 

 p. 228-62 ; "Variolite der Gabbrogruppe in Schlesien," Zeitscbr. deutscb. geol. 

 Ges. Bd. xxxiv. 1882, pp. 432-4. 



^^ A. Leppla, N. Jahrb. 1882, Bd. ii. pp. 134-5. 



'>** Chierici, Ann. Mines, vol. v. 1820, pp. 397-400. 



tit Morozzo, Mem. Acad. roy. Sci. Turin, vol. v. 1793, p. 165. 



XXX Fournet, Ann. des Sci. pbys. et nat. Soc. roy. d'Agric. Lyon, ser. 1, t. iv. 

 (1841) p. 1.56. 



j<§^ II. B. de Saussure, 'Voyages dans les Alpes,' t. v. (1796) pp. 415-417. 



II II II Eug. Geinitz, Tscherm. Min. u. petr. Mitth. i. (1878) pp. 136-153. 



•T«[11 Ibid. p. 146. 



**** Robilant, Mem. Ac. Roy. Sci. Turin, i. 1786, p. 242. 



