APPENDIX. 209 



with mixtures of charcoal with different soils, the charcoal 

 was also used free from any addition, and in this case the best 

 results were obtained. Cuts of plants from different genera 

 took root in it well and quickly ; I mention here only the 

 Euphorbia fastuosa andfulgens which took root in ten days, 

 Pandanus utilis in three months, P. amaryllifolius, Chamce- 

 dorea elatior in four weeks, Pipernigrum, Begonia, Ficus, 

 Cecropia, Chiococca, Buddleja, Hakea, PhyUanthus, Capparis, 

 Laurus, Stifftia, Jacquinia, Mimosa, Cactus, in from eight to 

 ten days, and several others amounting to forty species, in- 

 cluding Ilex, and many others. Leaves, and pieces of leaves, 

 and even pedunculi, or petioles, took root and in part budded 

 in pure charcoal. Amongst others we may mention the 

 foliola of several of the Cycadece as having taken root, as also 

 did parts of the leaves of the Begonia Telsairice, andJacaranda 

 brasiliensis ; leaves of the Euphorbia fastuosa, Oxalis Barri- 

 lieri, Ficus, Cyclamen, Polyanihes, Mesembrianthemum ; also, 

 the delicate leaves of the Lophospermum and Martynia, 

 pieces of a leaf of the Agave Americana ; tufts of Pinus, &c. ; 

 and all without the aid of a previously formed bud. 



" Pure charcoal acts excellently as a means of curing 

 unhealthy plants. A Dorianthes excelsa, for example, which 

 had been drooping for three years, was rendered completely 

 healthy in a very short time by this means. An orange-tree 

 which had the very common disease in which the leaves 

 become yellow, acquired within four weeks its healthy green 

 colour, when the upper surface of the earth was removed from 

 the pot in which it was contained, and a ring of charcoal of 

 an inch in thickness strewed in its place around the peri- 

 phery of the pot. The same was the case with the Gardenia. 



" I should be led too far were I to state all the results of the 

 experiments which I have made with charcoal. The object 

 of this paper is merely to show the general effect exercised 

 by this substance on vegetation, but the reader who takes 

 particular interest in the subject, will find more extensive 

 observations in the ' Allgemeine deutsche Gartenzeitung ' 

 of Otto and Dietrich in Berlin. 



