These great improvements formed quite an era in the history of mill machinery; and exercised the most important influence on the development of the cotton, flax, silk, and other branches of manufacture. Mr. Fairbairn says the system introduced by his firm was at first strongly condemned by leading engineers, and it was with difficulty that he could overcome the force of their opposition; nor was it until a wheel of thirty tons weight for a pair of engines of 100-horse power each was erected and set to work, that their prognostications of failure entirely ceased. From that time the principles introduced by Mr. Fairbairn have been adopted wherever steam is employed as a motive power in mills. Mr. Fairbairn and his partner had a hard uphill battle to fight while these improvements were being introduced; but energy and perseverance, guided by sound judgment, secured their usual reward, and the firm became known as one of the most thriving and enterprising in Manchester. Long years after, when addressing an assembly of working men, Mr. Fairbairn, while urging the necessity of labour and application as the only sure means of self-improvement, said, "I can tell you from experience, that there is no labour so sweet, none so consolatory, as that which is founded upon an honest, straightforward, and honourable ambition." The history of any prosperous business, however, so closely resembles every other, and its details are usually of so monotonous a character, that it is unnecessary for us to pursue this part of the subject; and we will content ourselves with briefly indicating the several further improvements introduced by Mr. Fairbairn in the mechanics of construction in the course of his long and useful career.