462 On the Effects of high Temperature on some Plants. 



The Orange and Lemon. A very high temperature appeared 

 peculiarly favourable to plants of these species, or, I believe, 

 more properly of this species ; for I consider both, with the 

 Citron and Shaddock, to be varieties only of the Lime. A 

 plant which sprang from seed in March, had, in the end of 

 August, attained the height of more than four feet, with pro- 

 portionate strength ; when wanting the place it occupied for 

 another purpose, it was removed from the house. 1 obtained 

 in April a plant of the China Orange, with one very small 

 fruit upon it, which has ripened in much apparent perfection, 

 and the tree exhibits every appearance of the most exuberant 

 health. 



The Mango. (Mangifera Indica.) This species of fruit 

 tree appears to possess great peculiarity of constitution ; for, 

 although a native of a very hot and bright climate, and ca- 

 pable of bearing, with apparent benefit, the hot drying winds 

 of Bengal, it vegetates freely, and retains its health in com- 

 paratively low temperature, and under a cloudy atmosphere. 

 The plants I possess, sprang from seeds in October 1818; 

 and their leaves acquired during winter, their proper dark 

 green colour, and remained in perfect health till spring, al- 

 though not possessing, at that period, a hot-house, I was very 

 ill prepared to preserve them. In March they began to shoot 

 a second time, without having been, I believe, at any period 

 subjected to a higher temperature than 60°, and some of them 

 are now shooting strongly ; although the temperature of my 

 house during the last five weeks, except once or twice in very 

 bright days, has rarely been so high as 60°. The mode of 

 growth of this plant appears also to be very singular ; it ex- 

 tends a few inches, and then closes its terminal buds, as if its 



