58 BOTANY 



this locality, and to proceed eastward towards 

 O'Hara's tower, after also having visited St. Michael's 

 cave, where he has, perhaps, found Scolopendiium 

 Hemionitis, and Adiantum Capillus-Veneris, and some 

 others of the fern tribe, in the crevices of the rock. 

 A road leads up to O'Hara's tower, but the lower one, 

 leading round to the Mediterranean stairs, is still 

 more interesting ; and on his way he will find the 

 sides of the rock covered with Teucrium polium, 

 Stachys circinata, Conyza saxatilis, and occasion- 

 ally he will meet with Calendula incana, and more 

 rarely Calendula stellata, and Convolvulus siculus. 

 Anchusa italica and Borago officinalis he will also 

 see here, but they are more abundant on the lower 

 parts of the rock. On arriving at about the old sub- 

 terranean barrack, now in ruins, before entering [the 

 tunnel which leads round the rock, it will be well to 

 scramble a little over the rocks in this locality, and 

 he will here see Silene velutina, and occasionally 

 Silene gibraltarica, with fine specimens of Delphinium 

 pentagynum. After passing the first tunnel he will 

 observe on the sides of the rock Linaria tristis 

 and L. villosa, and above these he will see Rham- 

 nus oleoides and Phylleria media. A little further on 

 takes him to the winding path leading to the Medi- 

 terranean stairs, and in this locality there is a 

 rich field of plants ; Phlomis purpurea and Chamae- 

 rops humilis being the most conspicuous. Among 

 many others he will gather Allium roseum, A. sphaero- 

 cephalum, Linaria amethystina, Nepeta tuberosa, 

 Statice emarginata, Aristolochia mauritanica, Ceras- 



