The technique of himself and his followers is characterized by the strongly marked forms of the design, and by the oblique formal hatchings of the shadows.
The mole-hills and serrated ridges of medieval maps were still in almost general use at the close of the 18th century, and are occasionally met with at the present day, being cheaply produced, readily understood by the unlearned, and in reality preferable to the uncouth and misleading hatchings still to be seen on many maps.
The volunteers assist in releasing the hatchings and excavating the nests to determine the hatching success rate.
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