On the sea-coast I found also several plants, whose characters similar to others I already knew, enabled me to recognize pretty well their properties. They are all alike, fat and strong-full of sap and clammy,--and it is evident that the old salt of the sandy soil, but still more the saline atmosphere, gives them these properties. Like aquatic plants they abound in sap, and are fleshy and tough, like mountainous ones; those whose leaves shew a tendency to put forth prickles, after the manner of thistles, have them extremely sharp and strong. I found a bush with leaves of this kind. It looked very much like our harmless coltsfoot, only here it is armed with sharp weapons,--the leaves like leather, as also are the seed-vessels, and the stalk very thick and succulent. I bring with me seeds and specimens of the leaves. (_Eryngium maritimum._)
The fish-market, with its numberless marine productions, afforded me much amusement. I often go there to contemplate the poor captive inhabitants of the sea.
A delicious day from morning to night! I have been towards Chiozza, as far as Pelestrina, where are the great structures, called _Murazzi_, which the Republic has caused to be raised against the sea. They are of hewn stone, and properly are intended to protect from the fury of the wild element the tongue of land called the Lido, which separates the lagoons from the sea.
The lagunes are the work of old nature. First of all, the land and tide, the ebb and flow, working against one another, and then the gradual sinking of the primal waters, were, together, the causes why, at the upper end of the Adriatic, we find a pretty extensive range of marshes, which, covered by the flood-tide, are partly left bare by the ebb. Art took possession of the highest spots, and thus arose Venice, formed out of a groupe of a hundred isles, and surrounded by hundreds more. Moreover, at an incredible expense of money and labour, deep canals have been dug through the marshes, in order that at the time of high water, ships of war might pass to the chief points. What human industry and wit contrived and executed of old, skill and industry must now keep up. The Lido, a long narrow strip of land, separates the lagunes from the sea, which can enter only at two points--at the castle and at the opposite end near Chiozza. The tide flows in usually twice a-day, and with the ebb again carries out the waters twice, and always by the same channel and in the same direction. The flood covers the lower parts of the morass, but leaves the higher, if not dry, yet visible.