HEAT OF THE ARUM, 01 



pretty Primula marginata, Curt. Mag. i. 19% 

 if brought into a room with a fire when 

 beginning to blossom, never opens another 

 bud ; while the American Cowslip, Bode- 

 catheon Meadia, t. 12, one of the most hardy 

 of plants with respect to cold, bears forcing 

 admirably well. 



Mr. Knight very satisfactorily shows, Phil. 

 Trans, for 1801, 343, that plants acquire 

 habits with regard to heat which prove their 

 vitality, and that a forced Peach-tree will 

 in the following season expand its buds pre- 

 maturely in the open air, so as to expose them 

 to inevitable destruction. See p. 56. A thou- 

 sand parallel instances may be observed, by 

 the sagacious gardener, of plants retaining the 

 habits of their native climates, which very 

 often proves one of the greatest impediments 

 to their successful cultivation. 



The most remarkable account that has 

 fallen in my way concerning the production 

 of heat in plants, is that given by Lamarck in 

 his Flore Francohc, v. 3. 53S, of the Common 

 Arum maculatiim, Engl Pot. t. 1298, (the 

 white-veined variety), the flower of which, 

 at a certain period of its growth, he as- 

 8 



