It is difficult to ascertain the whole number of boats employed at any one time. Many were owned and run by the proprietors of the canal; and many were constructed and run by private parties who paid the regular tolls for whatever merchandise they transported. Boats belonging to the same parties were conspicuously numbered, like railway cars to-day. From "Regulations relative to the Navigation of the Middlesex Canal," a pamphlet published in 1830, it appears that boats were required to be not less than 40 ft. nor more than 75 ft. in length and not less than 9 ft. nor more than 9-1/2 ft. in width. Two men, a driver and steersman, usually made up the working force; the boats, however, that went up the Merrimac required three men, one to steer, and two to pole. The Lowell boats carried 20 tons of coal; 15 tons were sufficient freight for Concord; when the water in the Merrimac was low, not more than 6 or 7 tons could be taken up the river. About 1830 the boatmen received $15 per month. Lumber was transported in rafts of about 75 ft. long and 9 ft. wide; and these rafts, not exceeding ten in number, were often united in "bands." A band of seven to ten rafts required the services of five men, including the driver. Boats were drawn by horses, and lumber by oxen; and "luggage boats" were required to make two and a half miles an hour, while "passage boats" attained a speed of four miles. Boats of the same class, and going the same way, were not allowed to pass each other, thus making "racing" impossible on the staid waters of the old canal. Whenever a boat approached a lock, the conductor sounded his horn to secure the prompt attention of the lock-tender; but due regard was paid to the religious sentiment of New England. Travelling in the canal being permitted on Sundays, "in consideration of the distance from home at which those persons using it generally are, it may be reasonably expected that they should not disturb those places of public worship near which they pass, nor occasion any noise to interrupt the tranquillity of the day. Therefore, it is established that no _Signal-Horn_ shall be used or blown on Sundays." The tariff varied greatly from year to year. In 1827 the rate from Lowell to Boston was $2.00 the gross ton; but many articles were carried on much lower terms.