ROOM I. ALG-E FUCOIDES. 25 



Brazils diamonds occur in breccia, composed of quartzose and 

 opaline pebbles, united by an arenaceous ferruginous cement ; 

 in Bundel Kaand, in sandstone, supposed to belong to the 

 Triassic deposits, for there are strata of that age 400 feet in 

 thickness beneath the lowest diamond beds, and indications of 

 coal underlying the whole. 1 



ALG^, Fuci, <fcc. Case A. Remains of several kinds of 

 vegetables of the simplest structure, as Fuci, Algae, Fungi, 



LlGK 1. FOSSIL FCCtJS IX M AIM-ROCK, BIGKOR, SUSSEX. 



Fucoides Targionii. 



(NAT. SIZE.) 



<tc., occur in a fossil state, and even some minute parasitical 

 species have been detected on the leaves of fern in coal shale. 



1 See " Wonders of Geology," 6th edit. pp. 703706, for an account 

 of Amber, Diamond, Bitumen, Petroleum, Anthracite, Plumbago, &c^ 

 " Medals of Creation," vol i. p. 83. 



A most important acquisition has very recently been made to the 

 Cabinet of Diamonds ; an unique series of crystallized specimens, 

 purchased of Professor Tennant, comprising upwards of sixty examples 

 of rare modifications of form, and of various colours. It formed part 

 of the celebrated cabinet of precious stones formed with great taste and 

 judgment, and regardless of expense, by the late Henry Phillip Hope, 

 Esq. Of the cubic crystal there are six ; of the octohedron, sixteen or 

 eighteen ; of the hemitrope, or macled crystals, four ; of grouped crys- 

 tals, thirty. This most interesting suite of gems includes also several 

 fine specimens of what are termed "diamonds of nature," which are 

 diverging fibrous concretions of this crystalline substance. A model of 

 the matchless Indian diamond, known as the Koh-i-noor, or Mountain 

 of Light, and now exposed to public view in the Great Exhibition, by 

 Her Majesty's gracious permission, will shortly be added to this unri- 

 valled collection. 



