At the age of seventeen Bowditch began to learn Latin without a teacher in order that he might read Newton’s Principia, and when he was old enough to vote “he was unsurpassed in mathematical attainments by any one in the Commonwealth.” But he must needs earn his bread and go to sea, and so in 1795 Nathaniel made his first voyage as captain’s clerk in the Salem ship Henry, Captain Prince, to Mauritius. His sea life covered a period of nine years, during which he made five voyages, one of them to Manila in 1796-7, in the ship Astrea, as supercargo with Captain Prince. The Astrea was the first American ship to fly the stars and stripes in the harbor of Manila, a fact of some historical worth. The American trade to the Orient was then in its beginnings and it was Elias Hasket Derby, who, with characteristic enterprise, sent the Astrea to Manila in search of sugar, pepper and indigo, of which she fetched home a large and valuable cargo.

Nathaniel Bowditch kept a journal of this voyage as was required by the laws of the East India Marine Society, and his journal, written in a precise and delicate hand, is preserved in the Society’s collection of records. His impressions of the capital city of the Philippines in 1797 read in part as follows:

“The city of Manila is about three or four miles in circumference, is walled all around, and cannon are placed at proper intervals, but we were unable to get much information with respect to the state of the place, as they were shy of giving any information to foreigners. The buildings within the wall are all of stone, and none except the churches is more than two stories high, on account of the violent earthquakes which they generally have at the breaking up of the monsoons. The month of March is when they most expect them, but on the fifth of November, 1797, we experienced several violent shocks at about 2 P. M. which came from the northward, and proceeded in a southerly direction, continuing with violence nearly two minutes. It threw down a large house half a league from the city, untiled several buildings, and did much other damage. It was not observed on board the ship lying off the bar. The motion of the earthquake was quicker than those usual in America, as the latter are generally preceded by a rumbling noise; the former was not.

Nathaniel Bowditch’s chart of Salem harbor

“The suburbs of Manila are very extensive; most of the business is done there. The houses of the wealthier class are of two stories, built of bamboo with thatched roofs. No house can be built in the suburbs without the particular permission of the Governor, fearing if they were too high an enemy might make use of them, as was the case when the English took the place formerly, for one of the churches near the walls was very serviceable to them.

“All the women have a little of the Indian blood in their veins, except the lady of the Governor and two or three others, though by a succession of intermarriages with Europeans they have obtained a fair complexion. The natives (like all other Malays) are excessively fond of gaming and cock-fighting. A theatre is established for the latter business from which the government draws an immense revenue, the diversion being prohibited at any other place. Sometimes there are five or six thousand spectators, each of whom pays half a real. A large sum arises from the duties on tobacco and cocoa wine. Tobacco is prohibited, but if you smuggle any on shore it cannot be sold for more than the ruling cost in America, notwithstanding the price is very high. Particular people, licensed by the King, are the only persons allowed to deal in it.

“All the natives chew dreca and betel, though not mixed with opium as in Batavia. This with chewing and smoking tobacco make their teeth very black. The segars used by the women, and which they smoke all day, are made as large as they can possibly get into their mouths. The natives are about as honest as their neighbors, the Chinese; they stole several things from us, but by the goodness of the police we recovered most of them.

“On the second of December, 1797, thieves broke into the house where we lived, entered the chamber where Captain Prince and myself were asleep, and carried off a bag containing $1,000 without awakening either of us, or any of the crew of the long-boat sleeping in an adjoining chamber.

“The guard boat discovered them as they were escaping and pursued them. They, in endeavoring to escape, ran afoul of a large boat, which, upsetting them, the money went to the bottom, and, what was worse, the bag burst and the money was all scattered in the mud, where the water was eight feet deep. However, by the honesty of the captain of the guard, most of it was recovered. The thieves were caught, and, when we were there in 1800, Mr. Kerr informed us that they had been whipped, and were to be kept in servitude several years.