1818.] with Prehnite, Zeolite, and Barytes. 109 



foot of the surface, and are covered by the trap in the uncon- 

 formable manner usually ascribed to it. 



The columns at the top of the hill dip at an angle of about 30 

 degrees in two directions, A, B; those on the north dipping 

 south, and vice versa ; this appearance is caused by a fault, C, 

 which crosses the centre of the hill from east to west. (See 

 Plate LXXXIII.) This vein, or fault, is about five feet in 

 thickness, including what appears like a wall on each side of 

 one foot thick, which can be separated from the centre without 

 any difficulty. This fault is as wide at the bottom as at the top, 

 and its direction is exactly vertical. It consists of basalt or trap 

 in such a state of decomposition that it cannot be ascertained 

 whether it is exactly similar to the basalt forming the hill. It 

 contains the following minerals : 



Radiated zeolite, or mesotype of Hauy : occurs abundantly in 

 nodular concretions. In the walls it fonns thin veins, which 

 penetrate the whole of the mass. Some of the specimens have 

 considerable beauty. Occasionally the zeolite assumes the form 

 of acicular four-sided prisms radiating from a centre. 



Prehnite. — This mineral has not been found before in England. 

 It occurs in massy, distinct concretions, rather abundantly, near 

 the surface of the fault, imbedded in sulphate of barytes, and 

 more rarely attached to the zeolite. Its colours are greyish 

 white, greyish green, and greenish white. Its hardness very 

 considerable. 



Sulphate of barytes occurs both crystallized and in a loose 

 state resembling sand, and constitutes the major part of the top 

 of the fault. 



I wish to acknowledge my obligation to the Rev. James 

 Yates, of Birmingham, for his assistance in arranging the 

 materials for this paper, for which purpose he has visited the 

 spot. I have the honour to be, Gentlemen, 



Your very obedient servant, 



John Finch. 



Article III. 



Some Remarks on the Climate and Situation of Nice, with, 

 Observations on the Temperature and Weather taken in the 

 Winter of 1816 and Spring of 1817. By a Correspondent. 



(To Dr. Thomson.) 



SIR, Londo -,1818. 



During a residence of some months last year at Nice, in a 

 climate so superior to our own, it was an object of some interest 

 to myself and party to make daily observations on the weather 

 and temperature, with a view of comparing them with those 



