Mlneralogical Report respectwg Elba. 177 
reality similar stripe-globules, forming a similar galvanic app^ 
ratus. It appears to him, therefore, by no means improbable, 
that the cause of the motion of the sap in all plants may be 
traced to the same principle and power, although under a va- 
riously modified organization. 
Amici had been prepossessed against the porous tubes of 
Mirbel, which he considered as striped vessels, similar to those 
above described, and the alleged pores he held to be nothing 
more than symmetrically arranged globules, which, by an opti- 
cal illusion, had the appearance of being perforated in the 
centre. Notwithstanding this preconceived opinion, however, 
and the natural prejudice in favour of his own theory, he became 
convinced of the contrary, discovered real pores, but found, at 
tile same time, that these vessels were not sap, but really and 
indisputably air-vessels, — a fact which Link had previously 
maintained. Professor Amici farther discovered, that the tuhi 
fihrosi of this and several other plants, which are their proper 
sap-vessels, possess similar stripes and globules. 
We understand that this ingenious philosopher has also made 
some very interesting observations respecting the structure and 
inotion of the globules in the bloodvessels of animals, which, we 
trust, will soon be communicated to the public 
Art. XXXIII . — Mimralogical Report, made by the Chief Eiu 
gineer of the Grand Duke of Tuscany to his Serene High-^ 
ness, respecting the Island of Elba *[*. 
P oRTOFERRAio and the forts of La Stella and II Palcone, are 
built upon a hill of grey argillaceous schistus, as may be easily 
observed on the sea-side. 
On the right of the road from Portoferraio to Rio, a short 
distance from the Porto del Ponticello, is a hill of indurated 
clay, containing crystals of quartz, some cubical, some irregular. 
• A notice of Amici’s discoveries respecting the form of the globules of blood,? 
will be found in the JEdin. Med. Journal, vol. xv. p. 120 - — Ed. 
•f Extracted, by petmission of the author, from Mr H. W. Williams’ interesk 
ing Travels, about to be published. — E d. 
VOL. II. B. JANUARY 1820. 
M 
