"We had a delightful ride on horseback," said Fred; "leaving Panama by the northwestern gate, which brought us to the fish-market on the beach. To judge by what we saw, Panama is justly named 'a place of fish,' as there seemed to be a supply three times as large as could possibly be wanted for the use of the inhabitants. There were Spanish mackerel, oysters, bonito, and a good many other fishes, and all of the very best quality, with the possible exception of the oysters. We asked if these oysters were the ones from which pearls are obtained, and they told us the pearl-fisheries were about a hundred miles down the bay, and the oysters not at all like those sold in the market. There was formerly a fine revenue from the pearl-fisheries, but the beds are practically exhausted, and of late years very little attention has been given to the business. [Illustration: ON THE NORTHEASTERN BEACH.] "From the market we galloped along the beach for a couple of miles, and then turned inland. We came out to the shore again, after winding among rocks and thick foliage, and followed along the bay till we reached the ancient city. "Everything is in the most complete ruin; what was left by Morgan has been vigorously attacked by the tooth of time. And I remark, by the way, that the tooth of time is much more effective in its work in the tropics than in the colder north, where the vegetation is less rapid and aggressive. Walls and towers are so overgrown with mosses and creepers that, in many instances, the structures are completely hidden from sight, and their positions are only indicated by their shape. Seeds carried by the birds, or wafted by the winds, fall into crevices between the stones; they are warmed into life by the temperature, and nourished by the moisture that prevails at all seasons of the year. They grow and flourish in spite of the inconveniences of their position, and after a time they force the stones apart, and the structure is weakened, and hastened to its overthrow. "Everywhere in Old Panama you can see evidences of this great force of nature. Much of the stonework of the city has been thrown down by the roots of the trees and plants, and in several places we saw stones of great weight resting entirely upon the roots of the trees that had lifted them up. Evidently the city was built to last, and it is a sad commentary upon the work of its founders that it was so soon destroyed. The walls were massive, and the stones carefully cut. The old Spaniards came to America to plant colonies, and make a permanent home, if we may judge by the way they constructed this important city, which was intended to command the commerce of the Pacific seas. [Illustration: WATCH-TOWER OF SAN JEROME.]