The performances of this engine indicate a very abundant and well sustained production of steam; but the extent of surface which it has been found necessary to expose to the heat, in order to obtain that effect, the great size of all the parts, and the quantity of fuel required — are faults which even a still more copious generation of steam would scarcely compensate. It is not by means of its heavy weight alone that such an engine would operate injuriously on the rails. The chimney from its great height — a height necessary to obtain that draught which in "The Novelty" is produced hy means of the air-forcing apparatus — gives a swaying motion to the engine from side to side; and the rails have thus a lateral as well as a longitudinal force applied to jerk them out of their places.

We observed in our first notice of this engine, (No. 322, p. 115) that it exhibited but a very partial fulfilment of the condition that it should "effectually consume its own smoke." As far as regards its performances on the first day of the competition, this statement was perfectly correct. It is only fair however to state, that in its more recent exhibitions there was scarcely any emission of smoke perceptible. We have heard that on the first day there was an accidental intermixture of coal with the coke; a circumstance which, if true, would sufficiently account for the appearance of smoke on that occasion.

(To be continued ir our next.)