TOL. VII.]]. PHILOSOPHICAL TRANSACTIONS. 723 



is annexed a Discourse of the Cacao-nut tree, and the use of its fruit. By W. 

 Hughes. London 1672, in 12ino. 



In this tract we have not only an account of the vegetables growing in the 

 English plantations of America, but also of several things not belonging to the 

 vegetable kingdom ; such as the white-coral-rocks, found upon the coast of Ja- 

 maica, as well as in other parts of America; the Sea-star fish; the Alligator; an 

 easy way of making good salt in Jamaica, &c. 



Some Additions to the Narrative that ivas published in Number 58, on 

 the Conjunction of the Ocean and Mediterranean by a Canal in 

 France, By Mons. de Froidour. N 84, p. 4080. 



In the description of this Canal, inserted in Number 58, mention was made 

 of the great magazine of water, for a continual supply in case of want. This 

 storehouse is in a valley a little above the town of Revel, at St. Feriol : and 

 is to be filled with the waters of the rivulet Audot, and those from the 

 rain and snow on the Black Mountain, This valley is very narrow at the begin- 

 ning, large in the middle, and straitened at the foot by the approach of two 

 rocky hills bounding it on both sides ; which, to make a lake and to keep in the 

 water, are conjoined by a causey, of such a height and thickness, that it may 

 be called a third hill. This causey is 61 fathoms broad, and is to be 25 high, 

 and 500 long, to gain the hills on both sides. The basis of this great work is a 

 solid body of masonry, laid and every way enclosed within the rock. It has only 

 a small opening below in the form of a vault, which is even with the ground, to 

 serve as a passage to the water of this magazine. This passage is 9 feet wide, 

 12 high, and 94 fathoms long. Upon this body of masonry, which by some 

 fathoms exceeds the height of the said vault or aqueduct, there is raised a thick 

 wall from the top of this dam, down in a straight line to the foot of it. This 

 wall encloses within its thickness another vault in the manner of a gallery ; the 

 entry whereof, being at the foot of the causey, is of the same height and breadth 

 with the former. This gallery answers directly from the top of the causey to 

 the orifice of the aqueduct, 5 fathoms above the surface of the ground, and 

 runs down along the side, and on the left hand of its mouth. 



On this work three thick walls are built across it from one end of the causey- 

 to the other, founded upon the body of the masonry, and running into the work 

 of the gallery which they traverse crosswise. They are ancred and enchased on 

 the right and the left, in the rocks of the two skirts of the valley. The first 

 wall, which is at the beginning of the causey, is 12 feet thick at the end, being 

 much broader below by reason of the talus or slope: it is to be but 12 fathoms 



4 y a 



