Slab serifs had already begun to be used for bold type by the 1840s .
Slab serifs were often quite lumpy in design and quite poorly matched to the body text face Slab serifs were intended to complement .
Slab serifs had already begun to be used for bold type by the 1840s , but they were often quite lumpy in design and quite poorly matched to the body text face they were intended to complement .