VOL. XXVIII.] PHILOSOPHICAL TRANSACTIONS. 73 



calls it aquastygia. I examined it, and found the charge unjust; that sugar 

 contained no worse substance in it than milk and honey, and manna, nay even 

 bread itself. 



The difficulty of showing the figure that sugar naturally shoots into lies in 

 this, viz. that all other salts shoot or crystallize, and make their figure in a cool 

 place; but sugar will crystallize only in a hot stove, and is more apt to be com- 

 pounded, and not to show its true prf^nitive texture. Thus it happens with snow, 

 which in its true simple shape is a hexagon, but cannot be always discovered 

 single. This is yet more easy to be accounted for than snow, and we have been 

 able to choose such parcels of that sugar called candy, as represent the following ' 

 figure, being a prism. I never questioned but that it was a true salt, having all 

 the properties of one. 



Fig. 21, pi. 1, shows the form of the crystals or salts of sugar, having two 

 bases, opposite, equal, and parallel; the others are parallelograms. 



Fig. 22, shows the basis of the preceding figure. 



Remarks on an undescribed Plant \ and other Particulars y observed in Wales. 

 By Mr. Edw. Lhwyd. N° 337, art. 34, p. 275. 



PI. 3, fig. 1, represents a remarkable sea-plant,* met with in dredging for 

 oysters, near Lhan Danwg in Meirionydshire. The plant is of a straw colour, 

 and about 3 inches high in the whole. The stems are hollow, and filled with 

 a k^id of thick reddish liquor, as much resembling blood as the juice of plants; 

 so that it seems referrible to the zoophytes. On pressing these stems at the 

 bottom between the fingers, the red liquor is forced up, and causes the droop- 

 ing flowers, or seed-vessels, to mount erect. 



We have lately discovered a sort of marble in that county, which when 

 polished represents a number of small oranges cut across; the cause of which is 

 an infinite quantity of tabipores, or alcyonium, stuck through the stone. This 

 might serve very well for inlaying work, as tables, windows, cabinets, closets, 

 &c. and would make curious saltsellers. 



Wales affords a good quantity of alum and copperas, particularly Pembroke- 

 shire and Caermarthenshire for the former, and Merionethshire for copperas, 

 where I saw a great vein of pyrites strongly impregnated. 



An Account of a Scirrhous Tumour, included in a Cystis, &c. By Mr. Richard 

 Russet, Surgeon at Lewes in Sussex. N'^ 337, art. 35, p. 276. 



Aug. 18, 1713, I was sent for to Mrs. Smith, who had been much reduced 



' Tubularia indivisa. Linn. Gmel. 

 VOL. VI. L 



