Mr! Ivory on the Equilibrium of Fluids. 185 



differt bulbo triplo major e ; scapo basi solid iusculo non 

 cavo; foliis (in caldario) non glaucescentibus ; planis, 

 nonjlexulis; florurn pedunculis acuto-triangularibus,?z07z 

 teretiusculis, laciniis corollae valde albis, nee lacteis; 

 tubo parum longioribus, nee tubi longitudine; corona 

 lutea, nee aurantid, sesquiduplo nee triplo Ion gioribus, 

 et laevi, non plicata, ut in Fl. Grceca supra citata. 

 /3. semiplena. Park. Parad. 85. jig. 2. 

 y. plena. Park. Parad. 85. f. 3. 4. 



I dare not cite the beautiful figure of tab. 1011, in the Bo- 

 tanical Magazine, there called Narcissus orientalis, var. Fl.Pl. 9 

 because that plant shows eight flowers on its slender scape, 

 which in that respect very well agrees; but I much doubt 

 whether ours would ever have more than four or five. But it 

 may be the double state of JV. Tazetta ofFl. Gr. I. c., as the 

 latter is there said to bear, when cultivated, many flowers. 



If this conjecture proves correct, it will afford another in- 

 stance of extremely similar species often occurring, as it were, 

 in pairs ; as in H. pracox of Tenore ; and PL tenuiflora Nob. 

 H.papyratia, Bot. Mag. 947, and//. Jasminea Salisb. et Nob. 

 and many others. 



That zealous and indefatigable Botanical Professor Dr. 

 Schultes, assisted by his son Dr. Schultes, have greatly 

 aided my endeavours to elucidate the Narcissece^ by completely 

 copying the whole of my last contribution to your excellent 

 Magazine, on these much favoured plants, into the Addenda at 

 the end of the 7th volume of their new edition of Linn. Syst. 

 Veg. just published; which will doubtless spread the matter 

 much more extensively than has hitherto been accomplished. 

 Chelsea, Feb. 7th, 1831. 



XXXIV. On an Omission in Clairaut's Theory of the Equili- 

 brium of a homogeneous Fluid; in some Remarks on the 56lh 

 Article of the " Bulletin des Sciences Mathematiques " for 

 August 1830. By JAMES IVORY, Esq. M.A. F.R.S.* 

 A N article in the Bulletin des Sciences Mathematiques for 

 ** August 1830, demands some observations from me. 



We may begin with stating, in what Clairaut's theory of 

 the equilibrium of a homogeneous fluid consists. This is a 

 point not in any respect doubtful. According to the inventor 

 of the theory and all other authors, two conditions are neces- 

 sary and sufficient for the equilibrium. Supposing the equi- 

 librium possible, it gives only one equation for determining 

 the figure of the fluid. No accelerating forces are taken into 



* Communicated by the Author. 

 N.S. Vol. 9. No. 51. Mar. 1831. 2 B account 



