Library inventories are widely acknowledged for their
importance in intellectual history, but there are few
detailed studies of library classification in this context.
The discussion centres on the inventories of 36 English
private libraries from 1521 to 1640, with a view to
understanding what could have prompted a compiler to adopt
one system of arrangement instead of another. Nine of the
inventories are transcribed from unpublished manuscripts,
including lists of the books of William Paget, 4th Baron
Paget (1617), William Somner (1639), and a previously
unidentified catalogue of the books of the physician William
Rant (1595). The classification of books was a matter
of some concern at the time: the problems raised by library
classification were beginning to attract the attention of
writers on the subject, and a compiler's approach was not
always as haphazard as it may seem at first. On the whole,
however, the classification of books was more spontaneous
than deliberate, and it is for this reason that it was
often finely attuned to the professional concerns and personal
interests of owners, as well as to the cultural climate
of the time (religious controversies, interest in languages
other than Latin). The medieval trivium was losing
its momentum in the classifications of the period, and mathematics,
for centuries associated with the quadrivium in
classifications, was viewed in a new light under the influence
of Neo-Platonism. New trends in library classification
appeared side by side with age-long practices, thereby
underscoring the deeply transitional nature of the period