A Z 



[45] 



BAG 



the calcareous zone: Lingula 

 Lewisii; Terebratula Wilsoni; 

 Bellerophon Aymestriensis ; Avi- 

 cula reticulata ; and the coral 

 Favosites Gothlandica. 



The Aymestry Limestone differs 

 in lithological aspect and useful 

 properties, from any under or over- 

 lying calcareous rocks, being much 

 less crystalline and pure than the 

 mountain or carboniferous lime- 

 stone, and inferior in quality to 

 the lower limestone of Wenlock. 

 Its earthy character renders it of 

 very great value as a cement, 

 particularly in subaqueous opera- 

 tions, the mortar formed of it 

 setting rapidly under water. Sir 

 R. Murchinson. Silurian System. 

 Azo'ic. (Destitute of animal remains.) 

 Those rocks in which no remains of 

 animal existences have been dis- 

 covered. 



A'ZOTE. (from a, priv. and guy, life, 

 Gr.) A constituent part of the 

 atmosphere, receiving its name 

 from its fatal effects on animal life. 

 It is now usually called Nitrogen, 

 which see. 



AZO'TIC. Consisting of azote; re- 

 sembling azote in its properties; 

 destructive of life. 



A'ZUEITE. Another name for Lazulit 

 or Lazulite ; a combination of 

 phosphoric acid, alumina, magnesia 

 and water. Primary form a right 

 rhombic prism of 121 3V. 



A'ZURE STONE. Lapis Lazuli; the 

 Lazurstein of Werner, and Lazulite 

 of Haiiy. A mineral consisting of 

 silica, alumina, lime, oxide of iron, 

 soda, magnesia, and sulfuric acid. 

 Specific gravity 2 95. The finest 

 specimens come from China, Persia, 

 and Siberia. 



B 



B'ABLNGTONITE. An earthy mineral, 

 so named by Levy, in honour of 

 Dr. Babington. It occurs in 

 distinct crystals at Arendal in 

 Norway. It is of a dark, greenish 

 black colour. 



BA'CCA. (bacca, Lat.) A fruit; a 

 berry. 



B A cci' FERGUS, (from bacca, a berry, 

 and fero, to bear, baccifere, Fr.) 

 Berry-bearing ; that produces 

 berries. 



BA'CULITE. (from baculus, Lat. So 

 named from its resemblance to a 

 straight staff.) A fossil, straight 

 chambered, conical, elongated and 

 symmetrical shell, depressed later- 

 ally, and divided into numerous 

 chambers by transverse, sinuous, 

 and imperfect septa ; the articula- 

 tions, or sutures, being indented in 

 the manner of the battlements of a 

 tower. The external chamber is 



considerably larger than the rest, 

 and capable of containing a con- 

 siderable portion of the animal. 

 Five species, namely, Baculites 

 Faujasii, B. obliquatus, B. verte- 

 bralis, B. anceps, and B. triangu- 

 laris, are described as occuring in 

 the cretaceous group. Sir H. De 

 La Beche says, it was once con- 

 sidered that the genus Baculites 

 was confined to the cretaceous 

 group, but, though more abundant 

 in it than in any other series, it is 

 not thus limited. The remains of 

 baculites have been hitherto found 

 in the chalk formation only, and 

 the baculite appears to have become 

 extinct simultaneously with the 

 last of the ammonites, at the 

 termination of the chalk formation. 

 This fossil may be seen beautifully 

 figured in Professor Buckland's 

 Bridgewater Treatise. 



