6 THE ESSEX NATURALIST figures, is consistent with an early sixteenth century date, but sometimes occurs later. I will not trouble you with the forms of letters now extinct, be- cause it is extremely unlikely that you will find graffiti containing the Saxon letters "thorn", "yogh", and the ancient forms of W and R, which persisted up to and a little beyond the Black Death, in the mid-fourteenth century. Although in written English you will find "thorn" used in the words "the" and "that" up to the end of the fifteenth century, I have never seen it in such late graffiti. Of course, the date of the wall, brick, stone, or woodwork operated upon is a terminus a quo, except in the rare case of re- used, inscribed brick or wood, or the not-quite-so-rare case of re- used stone. Therefore you would not expect any of the initials upon the obviously eighteenth century brick pillar at Dedham to be other than Georgian, or nineteenth century; in fact, I do not see any earlier than eighteenth century, or, indeed, later than mid- nineteenth century. A reliably-dated graffito is, on the contrary, a terminus ad quern for the material upon which it is inscribed—thus, the ancient timber door in Colchester Castle Prison, which bears the inscription "A H 1610", must clearly be at least of very early seventeenth century date, and might safely be supposed to be of the sixteenth century. In the nineteenth century an interesting and perhaps debatable change took place. Up to about 1850, the lettering of nineteenth century amateur graffiti was usually good, but perhaps rather narrower than the letter-forms used in eighteenth-century graffiti, following the contemporary trend of handwriting. Then, more widespread education led to an increase in the number of those who could scribble, but very soon after the Education Acts of 1862, while illiteracy declined so also did the quality of such writing as was produced. Concomitant with the decline in cali- graphy, was an increasing weakness in the form of initials cut on brick and stone, and this decline had progressed far by 1914. It has gone a little farther (but had not much farther to go towards complete illegibility) up to the present day: a fruitful source of evidence for this decline are the initials and dates cut by soldiers serving in the two wars. To offset this jeremiad, I should plead in defence of the moderns that they rarely have the time, or perhaps the boredom, which their eighteenth and seventeenth century pre- decessors so obviously had, and to spare. But this spectacle of edu- cation simultaneously widened and weakened is neither inspiring nor very interesting and we will turn back to some of the quaint and sometimes informing diagrams which are found as graffiti. The sixteenth century ship at Rainham, I have already dis- cussed. There is another ship, this time in full sail, to be seen in the