^74 CLARKE'S TRAVELS. 
gtko the concentric layers which denote concretionary forma* 
tiosy * Itis Imnily possible to have more striding proof of co¬ 
in cole n cep as to the origin of such a structure in the two sub¬ 
stances.! 
After we had passed Turao, a small plantation of olives af¬ 
forded us a temporary shelter : and without this, the heat was 
greater than we could have endured. Having rested an hour, 
taking coffee and smoking as usual with the Arabs of our party, 
we continued our journey. The earth w as covered with shell 
a variety ofthistles,that a complete collection of them would be 
a valuable acquisition in botany. A plant, which we mistook 
for the Jerusalem artichoke, was seen every w here, with a pur¬ 
ple head, rising to the height of five or six feet. The.scorch¬ 
ing rays of the sun put it out of our power to collect specimens 
of all these: not one of the party had sufficient resolution to 
descend from his horse, and abandon his umbrella, even for an 
instant. We distinctly perceived that several of those plants 
had not hitherto been described by any traveller ; and in the 
examination of the scanty but interesting selection which, with 
excessive fatigue and difficulty, we made along this route,-mot 
less than six new species have been discovered.^ Of these, the 
* “ J’en ai plusieur echantillons, ou Ton volt, quarul on les regarde eon.tre le jour 
par une de Ieurs extremities, des hexagones conccntriqucs , qu’on distingue quetque- 
fois jusque vers le eentre du prfsme: ees hoxagones sont formes par les lames qui 
nesont appliquees successivementa chacune de ces faces.” Hist. Nat. des Mini tom. 
ii« p. 31. 
i The mineralogical reader may add to this a remarkable fact, recently communi¬ 
cated to the author by the Rev. James Lambert , of Trinity College,. Cambridge. The 
radiating pillars upon the coast of St. Andrews’, in Scotland, hearing the name o 
the spindle rock, is nothing inore.tlian a spheroidal mass, which has occupied an or bleu f 
lar cavity, after the manner wherein zeolite is exhibited in porous aggregates; and 
it. is crystallized in prisms diverging from a common eentre, like the minuter ra¬ 
diating fibres of zeolite, carbonated lime, &c. fee. in amygrialoidal rocks. The author 
has witnessed a similar appearance, upon as large a scale, in the isle of Canna, in the 
Hebrides. The magnitude of certain phenomena of crystallization gome times leads , 
the mind'to doubt the nature of the process whence they have resulted 'Shosstire’s 
polished mountain, near St, Bernard in the Alps, is an instance of this kind. We are 
at no loss to explain the cause of lustre on one of the lateral planes of a small crystal, 
but cannot so readily conceive that the side of a mountain may have been thus modi¬ 
fied. • 
| The reader will find only the new species described here. 
JL A new species of Heliotrope, which we have called heljotropium hirsutum. 
This was found near Cana. Heliotropium foliis ia.to ovat is, plicatis. integer rimis, 
pilis_ depressis hirsutis; spieis."subsolitariis, pilis patulis hirsutissimis. Plants 
numilis ramosa; rami patentee, hirsuti. Folia petiolata vix polllcaria ; petioli 
semi-poliicares. Spies uniiaterales pedunculate?,# ad 3. poll ices longjBl Flores 
pediceliati serie simplici disppsiti. Calyces hirsutissimi. Corolla tubus colyace 
cl-irtiitiio longior, pulescens. 
%l. A non descript species of Larkspur , which we have called delphinium ocanium, 
found near the same place. Delphinium nectariis diphyilis. iolioiis eraarginatis 
obtusis-, corollis -pentapetalis, capsjilis solitaries, foliis multipariiti's. Rami, 
flexuosi, div :r cati, supra velloso incanr. Folia pubescentiamultiparlita, laeirbis 
1 inear \ ! mceolatis. Flores subracemosi, pauci Pedunculi bracteaU, crassi, 
villus? bracteie Bubulalae. Petala nectario longiora unguicuiata, obtusa. 
Cat. ar corolla longius, curvatum. Capsula ovato-eiliptica pubescens stylo par- 
sistente coronata. 
Ijl. Near Can* wo 4so found a non descript cottony species of o.riganvm, which we- 
