This size difference applies to many of the Silurian-Devonian families including the spiriferids, chonetids, atrypoids, atrypaceans, and some pentameroids (mostly among the gyidulids) (Boucot et al. 2012).

His administrant style was leading from the front.

Now mammas are sometimes exigeantes; and on a winter's evening I am loath to leave my comfortable fireside because Tommy has over-eaten himself and has the stomach-ache, or because that angel, Miss Lucy, has fallen down […]

An extension field, by which we mean a bigger field containing F, is automatically a vector space over F. We call it a finite extension if it is a finite vector space. By the degree of a finite extension we mean its dimension as a vector space. One common way of obtaining extension fields is to adjoin an element to F: we say that K=F(𝛼) if K is the field consisting of all rational expressions formed using 𝛼 and elements of F.