76 



On the occurrence of 



of the rocks, and by evaporation and absorption deposits a 

 portion of lime in the form of a simple carbonate, a kind of 

 calcareous mud, on the walls of the crevices. Such a deposit 

 you have before you in the sample in No. 1 Box. 



No. 1 Box. — Specimens of calcareous deposits from 

 Bordeaux Harbour. 

 Having reached this stage the deposit is ready for re- 

 solution and deposition in the holes and crevices of rock 

 masses either as crystals, stalactites or stalagmites, even 

 forming the cementing mass in recent conglomerates. 



Calcite or Carbonate of Lime thus formed and deposited, 

 is exhibited for your inspection to-night, every one being 

 a genuine Guernsey specimen. 



No. 2 Box. — Crystals from Fort Joli, from Captain 



Lukis's collection. 

 No. 3 Box. — Crystals from Bouet and Vale, also from 



Captain Lukis's collection. 

 No. 4 Box. — Crystals from Kellow's Quarry. 

 No. 5 Box.— Specimens from Rouge Rue. 

 No. 6 Box. — Specimens from a well in St. Julian's 



Avenue, 70 feet below the surface. 

 No. 7 Box. — Crystals from side of crevice, from Capt. 



Lukis's collection. 

 No. 8 Box. — Crystals with Quartz. 



Nos. 9 and 10 Boxes. — Specimens of Lime associated 

 with Metallic Ores. 

 If these specimens had taken years to collect, and were the 

 only ones obtainable, they would not offer strong evidence of the 

 presence of Lime in appreciable quantities. But it is not so. 

 In the Lukis collection of minerals and rocks, Carbonate of 

 Lime abounds. The specimens collected for to-night's ex- 

 hibition were collected in about two hours, and the probability 

 is, that among the rubbish thrown aside from the quarries, 

 tons might be found annually. 



