76 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
rightly placed by Christ as a high mountain plant of Teneriffe. 
The other species apparently occupy warmer districts. Numerous 
mules brought down fire-wood from the heights above. The 
logs were small, and appeared to be Tree-heath and the Retama 
{Cytisiis fragmns). The latter is the chief inhabitant of the 
region of the Canadas at about 8,000 feet. The plants were appa- 
rently badly infested with a coccus {Mytilas'pis pomorum). Lunch 
was taken under the shade of an enormous Chestnut tree with a 
trunk 30 feet in circumference. The real climbing began after 
this. The road became a narrow mule path, almost overgrown 
with dense thickets of the Tree-heath [Erica arborea), the 
"Brezo" of the natives. The heaths were shrubby, and 
none attained large size. In some parts of the island 
specimen trees are 25 to 30 feet high, with a trunk 
about a foot in diameter. All the large trees on this 
Cumbre had evidently been cut down long ago for firewood 
and for making charcoal. " Brezo," the guide said, ''makes 
excellent charcoal." Once or twice we were enveloped in mist, 
and everything loomed large and spectral. In bright intervals 
we could see a vast expanse of " Brezo " in flower, forming a 
whitish belt stretching for miles to right and left of us. Above 
could be seen bushes of native Broom, some Pines, and brown 
winter patches of the common Bracken. Higher still were the 
bare rocks crowning the summit of Pedro Gill. The region of 
Leguminosre was the last of the belts of vegetation through 
which we passed. The plants were Adenocarpus viscosus (or 
anagynts), having small leaves crowded thickly along the 
branches, with yellow flowers. Above these the rocks and soil 
were covered with bright patches of moss glistening with the 
moisture condensed from the mist. At the top of the pass, 
G,800 feet, the view was magnificent. There were only transient 
glimpses of the Peak and the Canadas, but on either side of the 
ridge it was possible to look down into the Orotava valley on 
the west, and see the " pinars " (pine trees) over Arafo on the 
east. More rain falls on the western slopes, hence they are 
cooler and moister. On the other hand, the eastern slopes are 
hotter and drier. Owing to this circumstance, the plants on 
the latter grow at a higher elevation. We met the species of 
Adenocarpus almost immediately we crossed the ridge, and the 
other zones, such as pine, tree-heaths, laurels, and grassy slopes, 
