..."Bart! Bart!" Van turned back and was tearing at the thing withfingers that were slippery with the sap that oozed from its torn skin... 
Various 「Astounding Stories, August, 1931」
...On the first day of tapping, the sap is too sweet; it is best during the following week and, when it becomes tart, no more must be drawn or the tree will be injured...
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 2」
..."So Henry 'n'int his head wid de sap out'n de big grapevime des ha'f way'twix' de quarters en de big house, en de goopher nebber wuk agin himdat summer...
Charles W. Chesnutt 「The Conjure Woman」
..."Wen de sap ris nex' spring, ole Henry 'n'inted his head ez yuzhal, enhis ha'r 'mence' ter grow des de same ez it done eve'y year...
Charles W. Chesnutt 「The Conjure Woman」
...The sapsucker alone drills rings or belts of holes for thesake of getting at the soft inner bark and drinking the sap thattrickles from it...
Neltje Blanchan 「Birds Every Child Should Know」
...Some of the first experimenters used boards, butwhere there were cracks, or the sap or bark on edges rotted, affordingthe animals a place to gnaw, they soon found a way out...
A. R. Harding 「Fur Farming」
...What ishis object? Good observers have stated thathe draws a little sap in order to attract flies andwasps; that the sap is not drawn for its ownsake, but as a bait for insects...
Fannie Hardy Eckstorm 「The Woodpeckers」
...That he did come to drink sap, and that heprobably ate the inner bark also...
Fannie Hardy Eckstorm 「The Woodpeckers」
...In a country where maple sugar is made, the bees get their first taste of sweet from the sap as it flows from the spiles, or as it dries and is condensed upon the sides of the buckets...
John Burroughs 「Birds and Bees, Sharp Eyes and, Other Papers」
... The sap was flowing, andleafless trees were covered with swelling buds...
Gene Stratton-Porter 「The Song of the Cardinal」
...It has a slenderbeak with needle-like mouth partswhich are stuck into the plant for extractingthe sap...
Leonard Haseman 「An Elementary Study of Insects」
...The loss of sap together withthe poisoning effect of the bite causesthe weakening of the plant or leaf withits ultimate death if feeding continues...
Leonard Haseman 「An Elementary Study of Insects」
...In the spring these eggshatch and the tiny nymphs begin toextract sap...
Leonard Haseman 「An Elementary Study of Insects」
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