3&4 Scientific Notices-^Minefalogj^. [Nov, 



4. Sodante of J^i^si^ 



l9tlB ^(lMaotP: 



The feirystals are distributed itt^ <ft^j4»WllteMf^io^^ 

 and ^sociated with grey feldspar, paife ^^^»ft<JMS^^dyeiifcous 

 spai^^'rid autrite ; the latter of varib^ .tihW^^c»lbiJft^Htfftlk)ft€n 

 perfectly white and transparent. 1 FrfftH^ttSifr^d^aWh^frions 

 in cDmbination with the hexahedroii', eJoii^ted-in the rUr^Jon 

 of one of the rhombohedral axes. Cleavage pretty Hi.stirffeHy 

 parallel to the faces of the dodecahedron, but much intefruj^ted 

 by conchoidal fracture. The surface of some of the crystals ite 

 rath'er S^ootl?^' but does not possess much lustre, which is 

 vitfeou^';' tnofe generally, the edges are rounded otf;^ ^aftjcl- - tfe^ 

 faces' curved so as to obhterate the regular f6rm4if b^l§|ii^ 

 rarie's fronipale greenish-white, to a sky-blue. Hardness 5-5 tO'6' 

 of Mbhfe* scale, between apatite and feldspar, nearest the latteV]^ 

 Specific gratity = 2-349. '.^i ^^O .i- b ■■^ 



The comparison bf these crystals, of which th^#ll^^%^¥ifea 

 Tarietiesi is connected with the question whetlrt*i^§%ijBtet<(;' 

 spinellaue, haiiyne, and crystallized lapis lazuli 'arer'"d'i8fe$et 

 species. The new varieties of the Vemvian soda/it c, exahlitt^d 

 by Mr. Haidinger, are in the Royal Museum at Edinburgh, and 

 were arranged by Professor Jamieson with haiiyne, which sub^ 

 stance appears to belong to the same species ; and M. M. 

 Bergemann, Nbggerath and Von Gerolt are of opinion that tb^ 

 preceding substances, especially the hallyne and spiiiella«§) 

 fonn varieties of one and the same species. — (Extracted ^^fil' 

 Mr. Haidinger's paper, Edin. Phil. Journal.) ^^ adi leiH 



-^sbiiinsY 95, Boracic Acid in Lamd'sixa do'fdfr 3iuiom*r 



> C bfioA jjjol uj^; 7i4^9 dlb^ y199t} aifioinm 



According to Moncand, in the ^Onan Isles/ boracic f-jf^ 



assists in rendering the lavas more easily fusible. Do the lavas 

 and obfeitfian df Lipari really contain boracic a&id^?^ ^e\ (green- 

 stone of Salisbury Craigs in this neighbourhood, contains Hum- 

 boldtite, a mineral rich in boracic acid. Does the mass of thi^. 

 greenstone rock contain any of this curious substance ? — (Edln©- 

 Bbil. Jounaal^ ^jLoh ^ii: ,.■,;: oiii a^av/jacl noiiaoiauinmo. 



- ! nadw VB ^d ZoOLod^;o') doidw lumioe sdi aldn- 



YiaiusinibLti i • ' ^ ^ ^>:)nihiii-Ji£^ .^nuiaiodi .o 



6. On the Circulatory System of Saunt, By Prori^)^^-, 



T^Vffil^^fiW^W if comparing the structure of the heart with 

 tferB^^'mHH^ e?ocodile, which is very unlike the heart of 

 the Turtle, to which Cuvier, in his Comparative Anatomy, has 

 compared it As ho correct description of the anatomidal 

 stnicture of the Saurii has ever been given to the pubHc, I shall 

 offer a brief outline of these organs in the crocodilus iucius, 

 which will serve as the type of all the lacerta. " ' 



