110 
ON THE PROPAGATION OF CAMELLIAS. 
effected, and circulation lias entirely ceased, the absence of light is rather to be desired 
than deprecated. These qualifications must, however, be regarded with the greatest 
accuracy ; and every precaution taken to produce and maintain the state herein 
described. A departure from this would counteract the good effects of the system, 
endanger the health of the plants, and engender prejudice. 
To these observations on radiation, Ave may be allowed to request more than 
ordinary notice. The cultivator who is anxious to obtain celebrity, and is yet 
unacquainted with the principles and influences of this process, is pursuing an uncer- 
tain route to a goal which nothing but a rare concatenation of fortuitous circum- 
stances can enable him to reach. But, enlightened on this point, he may continue 
his progress without a doubt of ultimately obtaining satisfactory and honourable 
success. It is to this, and principles such as this, that the horticulturist must 
alone look for advancement in his art, and these it will ever be our object to 
elucidate and establish. 
Inferences of a practical nature are also deducible from the fact of fluids circu- 
lating only when rarefied by heat, and of the same agent acting as the prime 
causative of accretions to the substance of plants. Since heat alone can induce 
an upward flow of sap, it is clear that the supply must be apportioned to the 
demand ; or, in other words, that heat must accompany moisture in equal 
proportion. A continued apidication of water in a low temperature would 
speedily surfeit plants, and either obstruct or rupture their vessels. Injury of a 
much more serious nature, or at least more immediately perceptible, follows a 
contrary course of treatment : withering and contraction are soon apparent, and 
the plant rapidly decays. 
Healthy developments are the consequences of appropriate excitation ; and the 
only method of ascertaining the degree of temperature required to render them of 
such a character, is by accurate observation of the habits of the plant. Either too 
great or too limited a supply of heat, or its employment at an unseasonable period, 
will produce similar results ; — sickly, imperfect, degenerate growth. In the practice 
of acclimatation, therefore, the gradual adaptation of plants to the climate, or of the 
climate to plants, should be the first and greatest, indeed almost the only concern of 
the cultivator. 
(To be continued.) 
ON THE PROPAGATION OF CAMELLIAS. 
Since the paper on this subject which appeared in our last number was written, 
we have been favoured with the following communication. As the process of 
grafting Camellias is here minutely detailed, and some excellent directions given for 
their management during that trying period, it will, we have no doubt, be found 
highly useful. We again commend the practice to all who estimate duly the value 
of improvements, or who would wish to avoid superfluous trouble and expense. 
