Sentence:  Many of the great fortunes in this country have been built up of pence and halfpence—I might also say of farthings. The odd halfpenny and three-farthings that you see (if you look close) upon the ticketed article in the shop-window, forms one of the littles; and a profit of hundreds of pounds, or often thousands, at the end of the year, forms the <WSD>mickle</WSD>. 
Meaning of the word marked with <WSD> tags:  A great amount.