saowari or suwarow nuts, are the
hard stone of the fruit and contain an oily nutritious seed. The genus
_Caryocar_ contains ten species, in tropical South America, some of which
form large trees affording a very durable wood, useful for shipbuilding.

[Illustration: A, leaf of Butterwort (_Pinguicula vulgaris_) with left
margin inflected over a row of small flies. (After Darwin.) B, glands from
surface of leaf by which the sticky liquid is secreted and by means of
which the products of digestion are absorbed.]

BUTTERWORT, the popular name of a small insectivorous plant, _Pinguicula
vulgaris_, which grows in wet, boggy land. It is a herb with a rosette of
fleshy, oblong leaves, 1 to 3 in. long, appressed to the ground, of a pale
colour and with a sticky surface. Small insects settle on the leaves and
are caught in the viscid excretion. This, like the excretion of the sundew
and other insectivorous plants, contains a digestive ferment (or enzyme)
which renders the nitrogenous substances of the body of the insect soluble,
and capable of absorption by the leaf. In this way the plant obtains
nitrogenous food by means of its leaves. The leaves bear two sets of
glands, the larger borne on usually unicellular pedicels, the smaller
almost sessile (fig. B). When a fly is captured, the viscid excretion
becomes strongly acid and the naturally incurved margins of the leaf curve
still further inwards, rendering contact between the insect and the
leaf-surface more complete. The plant is widely distributed in the north
temperate zone, extending into the arctic zone.

BUTTERY (from O. Fr. _boterie_, Late Lat. _botaria_, a place where liquor
is stored, from _butta_, a cask), a place for storing wine; later, with a
confusion with "butter," a pantry or storeroom for food; especially, at
colleges at Oxford and Cambridge, the place where food other than meat,
especially bread and butter, ale and wines, &c., are kept.

BUTTMANN, PHILIPP KARL (1764-1829), German philologist, was born at
Frankfort-On-Main in 1764. He was educated in his native town and at the
university of Goettingen. In 1789 he obtained an appointment in the library
at Berlin, and for some years he edited _Speners Journal_. In 1796 he
became professor at the Joachimsthal Gymnasium in Berlin, a post which he
held for twelve years. In 1806 he was admitted to the Academy of Sciences,
and in 1811 was made secretary of the Historico-Philological Section. He
died in 1829. Buttman