•306 GRAFTIXG THE CAMELLIA. 



from the giving off of the latent. Thus, if equal weights of ice at 32, 

 and water at 172, be mixed together, the whole of the ice will be melted, 

 but the tempei-ature of the mixture will be 32, so that 140 degrees are 

 lost, or converted into latent heat. 



If a tender plant that will not bear the frost, a Pelargonium for in- 

 stance, be exposed to an atmosphere of 32, or exactly the freezing point, 

 it will not be injured, but if the temperature sink below tliat point, 

 say 28, under ordinary circumstances, when tiie least circulation of air 

 is, the juices of the plant will be frozen, and it will be injured by the 

 application of perceptible heat, in its rising from 28 to 32 ; but if the 

 temperature when at 28 is raised by tlie freezing of water, when the act 

 of freezing, by giving off latent heat, raises the temperature to tiie freez- 

 ing point, the plant is uninjured. It follows, therefore, that the appli- 

 cation of water should commence before there is any alteration in the 

 temperature of tlie surrounding atmosphere, that is, in a morning before 

 tiie sun rises, or before a fire is put on, and continued until the tempe- 

 rature is raised to the freezing point ; but if the temperature of a 

 greenhouse should be sunk to 28, and a slight syringing of water ap- 

 plied, only sufficient to raise the temperature, by the congealation of its 

 particles, to 30, a great injury will be sustained ; if left to rise after- 

 wards by perceptible heat to 32, as the agitation which will have taken 

 place amongst the plants will have more effectually frozen their juices. 

 The water wiiich is used siiould not be much, if any, above the freezing 

 point, or as cold as can be procured, so that the temperature of the plant 

 should rise from 28 to 32, not by the application of a warmer substance 

 so nmch as tiie converting of latent into perceptible heat. It is also of 

 very great consequence that the leaves or no part of the plant should 

 be moved when in a frozen state, as the cellular tissue, of which thej' 

 are in a great measure composed, being of a very delicate texture, each 

 cellule being filled with ^vatery juice, Avhich becomes frozen, the least 

 bending of tiiat part of tlie plant would rupture the membrane, which 

 are only (and in many cases not quite) elastic enough to allow of the 

 expansion of the water by freezing ; it is therefore obvious that, instead 

 of the water being laid on by a heavy rose, as I have sometimes seen, 

 it sliould be done with a very fine syringe, like a shower of dew. 



GRAFTING THE CAMELLIA. 



BY A LONDON NCBSERYJIAN. 



In a recent Number of this Magazine there is an article on Grafting, 

 and reference is made to the Camellia. Now for successful results the 

 particulars of practice are not sufficiently given. Having a very exten- 

 sive stock, and increasing an immense number each year by grafting, I 

 forward the following remarks, which, if properly attended to, success 

 in every case is certain. 



I beg to observe, that in grafting the juices of the stock should be 

 moving ; therefore, every plant of the single red, which is to be grafted, 

 should immediately be placed in a frame or moist stove, where the heat, 

 by fire or dung, is not under sixty degrees, and be there retained till the 



