543 



wine, till a saturated solution was obtained. This, on cooling, im- 

 mediately deposited some yellow amorphous flocks. These were 

 separated by filtration, and the clear liquid slowly evaporated in 

 vacua. On standing a few days, it deposited a quantity of golden 

 3'ellow slender crystals, about half an inch in length. The crystals 

 had considerable lustre, and were very brittle. To this crystalline 

 substance I purpose giving the provisional name of Gardenine. 

 Gardenine is nearly insoluble both in cold and hot water. It dis- 

 solves pretty readily in alcohol, but much less readily in ether ; 

 ether yielding bright yellow solutions, out of which it crystallizes 

 on cooling. Alkalies, such as ammonia, do not appear to increase 

 its solubility. It is more soluble in hot hydrochloric and sulphuric 

 acids than in water, and is precipitated, apparently unchanged, on 

 the addition of water. Its alcoholic solutions give no precipitate 

 with ammonio-nitrate of silver, or with basic acetate of lead. 

 When gardenine is digested with concentrated nitric acid, it is 

 rapidly decomposed ; nitropicric acid, but apparently no oxalic acid, 

 being produced. 



Unfortunately, from the very small quantity of resin at my dis- 

 posal, I was unable to prepare a sufficient amount of the gardenine 

 either to subject it to analysis or to examine it more particularly. 

 Dr. Royle has, however, commissioned a large quantity of the resin 

 from India, which I trust will ere long enable me to complete its 

 examination. Gardenine appears to belong to the tolerably nume- 

 rous class of indifferent crystallizable resins, of which it is certainly 

 one of the most beautiful. 



IV. "On the Representation of Polyhedra." By the Rev. 

 THOMAS P. KIRKMAN, A.M. Communicated by ARTHUR 

 CAYLEY, Esq., F.R.S. Received August 6, 1855. 



This paper constituted an addition to the paper by the same 

 author read June 21, 1855. 



The author observes that to every p-acral q-edron corresponds a 

 p-edral q-acron, the summits and faces of either having the same order 

 and rank as to the number of edges with the faces and summits of the 



