Dworzak noted the occurrence of traces of this element in wheat grown along the Nile, and knop found it in the soil.
The foot is circular, of the same diameter as the bowl, and the knop projects in.
Hewitt calls attention to the knop, or button, surmounting the helmet, as a peculiarity.
For its determination knop's sodic hypobromite method, on account of its convenience, is now generally preferred.
A globe-shaped ciborium, with cresting and knop of the fourteenth century, is interesting.
The "knop and flower" border of alternately closed and shut lotus flowers is separated from the centre by a band of rosettes.
It has a spire-like top with windows and pinnacles between round its base, a feature which is repeated on the knop.
Two years later knop confirmed both the absorption and the toxicity of copper by his experiments on maize.
Here, however, the figures of supernatural beings are replaced by rosettes and by two lines of the knop and flower ornament.
The knop has eight roundels with niello crosses crossleted; on the stem are saints in niello in vesicas.