Starting from 'set in a type (as boldface) readily distinguishable from that of the lightface running text which defines, explains, or identifies the entry', does it naturally lead to the conclusion 'Boldface type, on average, has 60% more weight than lightface type.'
set in a type (as boldface) readily distinguishable from that of the lightface running text which defines, explains, or identifies the entry###Boldface type, on average, has 60% more weight than lightface type.