worthy a worke as I could willingly commit
to your care and workmanship.
``Yours ever, THOMAS HEYWOOD.''


In the eighteenth century printers and
authors had become hardened in their
sins, and seldom made excuses for the
errors of the press, but in the seventeenth
century explanations were frequent.

Silvanus Morgan, in his _Horologiographia
Optica. Dialling Universall and
Particular, Speculative and Practicall,
London_ 1652, comes before his readers
with these remarks on the errata:--


``Reader I having writ this some years
since, while I was a childe in Art, and by
this appear to be little more, for want of
a review hath these faults, which I desire
thee to mend with thy pen, and if there

be any errour in art, as in chap. 17
which is only true at the time of the
Equinoctiall, take that for an oversight,
and where thou findest equilibra read
equilibrio, and in the dedication (in some
copies) read Robert Bateman for Thomas,
and side for signe and know that _Optima