THE GEEEN-HOUSE. 



311 



Bryophy'Uum caly&inum. 

 Gloxinia speciosa. 

 Dionce^a muscipula. 

 Verea crenafa. 

 A^rum, various species. 

 Hoy a carnosa. 



A^loe, most of the species. 

 Xylophy'lla, any species. 

 Crdssula, many species. 

 Cotyledon orbicularis. 

 All the squamose bulbs, and 

 probably many others. 



Other plants throw out roots from the petioles of 

 the leaves, without, as far as has hitherto been ob- 

 served, having the power to generate buds. Such 

 are Camellia, jducuha, Laurus, &c. Others root 

 from the points of their lateral branches, without, as 

 far as has been observed, having the power to form a 

 main shoot, as the Aiiracaria or Brazilian pine. 



We have already described the mode in which 

 scaly bulbs may be increased by the leaves, viz. by 

 pulling a full-grown leaf oiF with the scale attached, 

 and planting it in a pot of sandy loam; this will 

 form a callosity of granulous matter^ which soon takes 

 the form of a young bulb or bulbs. 



Tunicate bulbs we have also shown may be in- 

 creased by cutting off the upper part of the bulb hori- 

 zontally, when each coating will throw out little gems 

 from its upper edge. 



These and other modes of propagating plants are 

 partly the result of accident, and partly of the great 

 progress made in vegetable physiology. The more 

 common modes of dividing the roots of tuberous or 

 fusiform plants, and dividing at the root of fibrous 

 perennials, or under-shrubs, are so simple and well 

 know^n as not to recjuire description. 



