To the second trio, only one boat of each class is to be altered; one set of machinery furnished; one corps of engineers maintained, and coal for one round trip supplied, with the incidental expenses, to move 420 tons of freight. The costs of alterations and adaptations of the first trio are two-fold those of the second; the cost of machinery greater to the first trio than to the second; the costs of engineers two-fold to the first trio; the costs of coal about the same to each, with greater incidental expenses to the first than to the second _per tons of freight moved_. The differences in the two trios are in their _steam capabilities and in their times_; the second requires about one day extra on the canal, as possibly due to the locking of the tow, though no extra time is required where both locks of the pair are ready. But the extra twenty tons of freight more than pays the extra time. The times of transit or rates of speed to the two eras are very nearly alike, the steamers of the first having _greater steam capabilities_, as due to their boat in tow, whilst those of the present era have reduced their steam capabilities to increase their cargoes from the 180 tons to 200 tons. The times of transit, or rates of speed, are given in the following miscellaneous record, and as published, from time to time, from 1858 to 1862: The _Wack_ was 7 days, total time, with boat in tow, from Buffalo to Troy. The _Wack_ was 4 days 16 hours, net time, with half freight, from Troy to Buffalo. The _Sternburg_ was 28 hours, total time, with boat in tow, from Buffalo to Rochester, 93 miles, averaging 3-1/3 miles per hour. The _Ruggles_ was 5-1/2 days, net time, with boat in tow, from Buffalo to Troy, and 6 days 14 hours, net time, from Buffalo to New York. The _Eclipse_ was 7-1/2 days, total time, without tow, from Buffalo to Troy, and 5-1/2 days, total time, without tow, from Troy to Buffalo. The _Gold Hunter_ was 7 days 5 hours, total time, without tow, from Buffalo to Troy. The _Rotary_ was 4 days 4 hours, total time, with half freight, from Troy to Buffalo, and 3 days 16 hours, net time. The _Bemis_, a screw-tug, with three boats, was 5 days and 8 hours, net time, from Buffalo to Schenectady, 321 miles, average 2-1/2 miles per hour. The _Washington_, do., with 3 boats, was 5 days 2 hours, net time, from Buffalo to Cohoes, 340 miles, average 2-3/4 miles per hour. The _Dan Brown_, do., with three boats, was 6 days, net time, from Buffalo to Albany, 351 miles, average nearly 2-1/2 miles per hour; and was 7 hours from Buffalo to Lockport, 31 miles, averaging 4-2/3 miles per hour. YEARS 1871 AND 1872, AS PUBLISHED. The _Dawson_ and the _Cathcart_ have both made and repeated through trips from Buffalo to Troy, with 5/6 of horse cargoes, in about 7 days, total time.