ANNOTATIONS AND AUDITIONS. 145 



p. 55, pi. 16. In the Andes of Caxamarca we found two 

 Alpine Mimosese (Mimosa montana and Acacia revoluta), 

 8500 and 9000 Trench (about 9060 and 9590 English) 

 feet above the surface of the Pacific. 



Hitherto no true Mimosa (in the sense established by 

 Willdenow), or even Inga, has been found in the temperate 

 zone. Of all Acacias, the Oriental Acacia julibrissin, which 

 Eorskal has confounded with Mimosa arborea, is that which 

 supports the greatest degree of cold. In the botanic garden 

 of Padua there is in the open air a tree of this species with 

 a stem of considerable thickness, although the mean tem- 

 perature of Padua is below 10.5 Reaumur (55.6 Eahr.) 



(19) p. W. "Heaths." 



In these physiognomic considerations we by no means 

 comprise under the name of Heaths the whole of the natural 

 family of Ericaceae, which on account of the similarity 

 and analogy of the floral parts includes Rhododendron, 

 Befaria, Gaultheria, Escallonia, &c. We confine ourselves 

 to the highly accordant and characteristic form of the species 

 of Erica, including Calluna (Erica) Yulgaris, L., the common 

 heather. 



While, in Europe, Erica carnea, E. tetralix, E. cinerea, 

 and Calluna vulgaris, cover large tracts of ground from the 

 plains of Germany, Erance, and England to the extremity oJ: 

 Norway, South Africa offers the most varied assemblage of 

 species. Only one species which is indigenous in the 

 southern hemisphere at the Cape of Good Hope. Erica um- 

 bellata, is found in the northern hemisphere, i. e. in the 



