The word hereof is actually not a legal term. Its meaning in court documents is no different from its ordinary dictionary definition -- Merriam-Webester defines hereof as meaning of this.. It's one of those words used by lawyers and nobody else.
The variety of cabbage commonly known as the Flat Dutch, shown in Fig. 6, of which there are many strains, is a moderately long-season variety. The head is very solid and flat; it measures about 12 inches across and 8 inches deep, and weighs from 8 to 12 pounds.
Seed from such a head will probably show rapid deterioration in later generations, and may even go so far as to produce an open, and worthless head such as that shown in Fig. 17. A head of cabbage in which the leaves properly overlap, and in which the head is perfectly solid, is shown in Fig. 6. 4.