Chester Rows east side of Northgate Street. Originally there were also Rows in Lower Bridge Street but these were blocked during the 17th and 18th centuries. As the ground floor buildings are usually lower than the street level, they are sometime known as "crypts". However, as the architectural historian Nikolaus Pevsner points out, this is not a strictly accurate description because the level of the floors of the buildings is a half-storey rather than a full-storey level below the street. Rows were built in the four main streets leading from Chester Cross, each of which originated during the settlement's early development. In
Whiskers of nerve cells innervating the mystacial vibrissae of a seal has been estimated to be in excess of 300,000. Manatees, remarkably, have around 600 vibrissae on or around their lips. Whiskers can be very long in some species; the length of a chinchilla's whiskers can be more than a third of its body length (see image). Even in species with shorter whiskers, they can be very prominent appendages (see images). Thus, whilst whiskers certainly could be described as "proximal sensors" in contrast to, say, eyes, they offer a tactile sense with a sensing range that is functionally very significant. The