176 DR. J. D. HOOKER ON THE PLANTS 
the summit of Mount Maveya, alt. 1668 ft., erroneously supposed 
io be 5000 ft. high and the summit of the chain. The true 
summit is Mount Shomba, alt. 1767 ft. On the 28th, having 
crossed the Sierra, he reached the village of Mangetsi, about 
eighty miles in a straight line from the coast. 
Mr. Mann desires publicly to express his great obligations to 
the various Spanish and Portuguese officials on the coast, and 
especially to Consul Hutchinson at Fernando Po, and to the 
Missionaries at Victoria (Ambas Bay), the Revs. Messrs. Saker 
and Smith, but for whose cordial aid the Cameroons Mountains 
could not have been successfully explored by any European at the 
time of his visit. At Corisco he was much indebted to Mr. 
Mackey of the American Mission, who rendered him active and 
essential service. 
The number of plants collected during these and Mr. Mann’s 
other expeditions on the coast, amounts to probably 3000 flower- 
ing species, of which 237, found at elevations above 5000 ft., are 
those with which I propose to deal in the present paper. Nearly 
half of this number (viz. 112) are new species, and upwards of 
half are from the Cameroons Peaks. 
Excluding the few peculiar to St. Thomas’s and Prince’s Islands, 
we have on the Cameroons Mountains, at elevations above 5000 ft., 
203 species, and on Fernando Po Peak 102, of which 68 are 
common to both localities. The Monocotyledons bear a larger 
proportion to the Dicotyledons on the Cameroons (1: 2:3) than on 
Fernando Po Peak (1:3:2). The proportion of nondescript to 
the previously known species was nearly the same on the Came- 
roons (1:2:2) as on Fernando Po (1:23); but of the plants 
common to both localities the proportion of novelty is much 
smaller (1: 2:8). 
I have adopted the above-mentioned altitude of 5000 ft. as the 
lower limit of the Temperate Flora, because both on Fernando Po 
and the Cameroons Mountains the temperate forms preponderate 
largely at that elevation. In these mountains, however, as in all 
other tropical ones, on the one hand tropieal genera and species 
ascend to this and to much greater elevations, and on the other 
some temperate forms descend considerably lower, than their 
respective temperatures would lead us to expect. This is partly 
owing to the very varied conditions of exposure, humidity, and 
temperature which may be found at the same elevation in 4 
mountain-region traversed by gorges and ridges, aud still more 
io the equable annual temperature favouring both the ascent 
