Atdumtial Bloiviiig of the Narcissus. 343 



vantages which have already been derived from the above prin- 

 ciple; as, with the exception of the original screw press, we do 

 not recollect seeing one to which it has not been applied. 



LXVII. Autuinnal Blotsohig of the Narcissus. 



To the Editors of the Philosophical Magazine andjoiirnal. 



y Hartwell, Nov. 12, 1822. 



Gentlemen, — Ajast winter I commiuiicated in the Philoso- 

 phical Magazine*, a catalogue of plants which flowered unsea- 

 sonably. I have now further to record a very unusual bo- 

 tanical phaenomenon. The Narcissus Tazetta, or N. 07-ie}italis 

 of Curtis, being the white Polyanthus Narcissus of the shops, 

 is now in flower in the open ground in my garden at Hartwell 

 in Sussex. This plant was coming into flower at its usual 

 time last April, when the blooms before their expansion were 

 eaten off" by the slugs, and the stalk afterwards cut down. If 

 this were the cause of the reflorescence of the plant in Novem- 

 ber, florists may learn from this accident how to produce 

 an autumnal crop of spring flowers, by cutting them off" in 

 spring. Yours, 



T. FoRSTER. 



LXVII I. On the anomalous magneticAction of hot Iron bet'ween 

 the white and blood-red Heat. By Peter Barlow, Esq. 

 of the Royal Military Academy. Comtmmicated by Major 

 Thomas Colby, of the Royal Engineers, F.R.S.f 



In consequence of certain theoretical results relative to the 

 magnetic action of iron, obtained by Mr. Charles Bonnycastle, 

 I was desirous of ascertaining the relative attraction which 

 different sjjccies of iron and steel had for the magnet; and 

 with this view I procured two bars of each of the following 

 descriptions of metal, 'i't inches in length, and one inch and a 

 quarter stjuare, which being placed successively in the direc- 

 tion of the dip, at a certain distance from the compass, the 

 disturbance occasioned by each was carefully noted ; first with 

 one end upwards, and then with the other; and assuming the 

 tiingents of the angles as the measure of the disturbing power, 

 I obtained the following specific results, viz. 



* Vol. lix. p. 212. 



f From tlic Transactions of tlic Philosophical Society, Part I. for 1822. 



Malleable 



