for scientific and educational purposes, and

not for sale or profit.

494. Annatto, roucou, rocoa, or orleans, and all extracts of. 495. Apatite.

496. Arrowroot in its natural state and not manufactured. 497. Arsenic and sulphide of arsenic, or orpiment.

498. Arseniate of aniline.

499. Articles in a crude state used in dyeing or tanning

not specially provided for in this section.

500. Articles the growth, produce, or manufacture of the United States,

not including animals,

when returned after having been exported,

without having been advanced in value,

or improved in condition

by any process of manufacture or other means;

casks, barrels, carboys, bags, and

other containers or coverings of American manufacture

exported filled with American products,

or exported empty and returned filled with foreign products, including shooks and staves when returned as barrels or boxes; also quicksilver flasks or bottles,

iron or steel drums used for the shipment of acids,

of either domestic or foreign manufacture,

which shall have been actually exported from the United States;

but proof of the identity of such articles shall be made, under general regulations to be prescribed by the Secretary of the Treasury,

but the exemption of bags from duty shall apply only to such domestic bags as may be imported by the exporter thereof, and if any such articles are subject to internal-revenue tax at the time of exportation,

such tax shall be proved to have been paid before exportation and not refunded;

photographic dry plates or films of American manufacture (except moving-picture films),

exposed abroad,

whether developed or not, and

films from moving-picture machines,

light struck or otherwise damaged, or worn out, so as to be unsuitable for any other purpose than the recovery of the constituent materials,

provided the basic films are of American manufacture, but proof of the identity of such articles shall be made,

under general regulations to be prescribed by the Secretary of the Treasury:

Provided, That this paragraph shall not apply to any article upon which an allowance of drawback has been made,

the reimportation of which is hereby prohibited

except upon payment of duties equal to the drawbacks allowed; or to any article manufactured in bonded warehouse and exported under any provision of law:

And provided further, That when manufactured tobacco which has been exported without payment of internal-revenue tax

shall be reimported it shall be retained in the custody of the collector of customs

until internal-revenue stamps in payment of the legal duties shall be placed thereon.

501. Asbestos, unmanufactured.

502. Ashes, wood and lye of, and beet-root ashes.

503. Asafetida.

504. Balm of Gilead.

505. Barks, cinchona or other from which quinine may be extracted.

506. Beeswax.

507. Binding twine:

All binding twine manufactured from New Zealand hemp, manila, istle or Tampico fiber, sisal grass, or sunn,

or a mixture of any two or more of them,

of single ply and

measuring not exceeding six hundred feet to the pound: Provided, That articles mentioned in this paragraph,

if imported from a country which lays an import duty on like articles imported from the United States,

shall be subject to a duty of...one half of one cent per pound. 508. Bells, broken, and bell metal broken and

fit only to be remanufactured.

509. Birds, stuffed, not suitable for millinery ornaments.

510. Birds and land and water fowls.

511. Bismuth.

512. Bladders, and

all integuments, tendons and intestines of animals and fish sounds,

crude, dried or salted for preservation only, and unmanufactured,

not specially provided for in this section. .

513. Blood, dried, not specially provided for in this section. 514. Bolting cloths composed of silk,

imported expressly for milling purposes, and

so permanently marked as not to be available for any other

use.

515. Bones, crude, or not burned, calcined ground, steamed, or otherwise manufactured, and

bone dust or animal carbon, and bone ash,

fit only for fertilizing purposes.

516. Books, engravings, photographs, etchings, bound or unbound, maps and charts

imported by authority or for the use of the United States or for the use of the Library of Congress.

517. Books, maps, music, engravings, photographs,

etchings, bound or unbound, and charts,

which shall have been printed more than twenty years at the

date of importation,

and all hydrographic charts, and publications

issued for their subscribers or exchanges

by scientific and literary associations or academies, or publications of individuals for gratuitous private circulation, and public documents issued by foreign governments.

518. Books and pamphlets printed chiefly in languages other than English; also

books and music, in raised print, used exclusively by the blind.

519. Books, maps, music, photographs, etchings, lithographic prints, and charts,

specially imported,

not more than two copies in any one invoice,

in good faith,

for the use and by order of any society or institution

incorporated or established solely for religious, philosophical, educational, scientific, or literary purposes, or

for the encouragement of the fine arts, or

for the use and by order of any college, academy, school, or seminary of learning in the United States, or

any state or public library, and

not for sale,

subject to such regulations as the Secretary of the Treasury shall prescribe.

520. Books, libraries, usual and reasonable furniture, and similar household effects of persons or families from foreign countries,

all the foregoing if

actually used abroad by them not less than one year, and not intended for any other person or persons, nor for sale. 521. Brass, old brass, clippings from brass or Dutch metal, all the foregoing, fit only for remanufacture.

522. Brazilian pebble, unwrought or unmanufactured. 523. Bristles, crude, not sorted, bunched, or prepared. 524. Bullion, gold or silver.

525. Burgundy pitch.

526. Cadmium.

527. Camphor, crude, natural.

528. Castor or castoreum.

529. Catgut, whip gut, or worm gut, unmanufactured.

530. Cerium, cerite, or cerium ore.

531. Chalk, crude, not ground, bolted, precipitated, or otherwise manufactured.

532. Chromate of iron or chromic ore.

533. Civet, crude.

534. Clay:

Common blue clay and

Gross-Almerode glass-pot clay,

in cases or casks

suitable for the manufacture of crucibles and glass melting pots or tank blocks.

535. Coal, anthracite, and coal stores of American vessels, but none shall be unloaded.

536. Coal tar, crude, pitch of coal tar, and

products of coal tar known as dead or creosote oil,

benzol, toluol, naphthalin, xylol, phenol, cresol, toluidine, xylidin, cumidin, binitrotoluol, binitrobenzol, benzidin, tolidin, dianisidin, naphtol, naphtylamin, diphenylamin, benzaldehyde, benzyl chloride, resorcin,

nitro-benzol, and nitrotoluol,

naphtylaminsulfoacids and their sodium or potassium salts, naphtolsulfoacids and their sodium or potassium salts, amidonaphtolsulfoacids and their sodium or potassium salts, amidosalicylic acid, binitrochlorbenzol, diamidostilbendisulfoacid,

metanilic acid, paranitranilin, dimethylanilin;

all the foregoing not medicinal and

not colors or dyes.

537. Cobalt and cobalt ore.

538. Cocculus indicus.

539. Cochineal.

540. Cocoa, or cacao, crude, and fiber, leaves, and shells of. 541. Coffee.

542. Coins of gold, silver, copper, or other metal.

543. Coir, and coir yarn.

544. Copper ore;

regulus of, and black or coarse copper, and copper cement; old copper, fit only for remanufacture,

clippings from new copper, and

copper in plates, bars, ingots, or pigs,

not manufactured or specially provided for in this section. 545. Composition metal of which copper is the component material of chief value,

not specially provided for in this section.

546. Coral, marine, uncut, and unmanufactured.

547. Cork wood, or cork bark, unmanufactured.

548. Cotton, and cotton waste or flocks.

549. Cryolite, or kryolith.

550. Cudbear.

551. Curling stones, or quoits, and curling-stone handles. 552. Curry, and curry powder.

553. Cuttlefish bone.

554. Dandelion roots, raw, dried, or undried, but unground. 555. Diamonds and other precious stones,

rough or uncut, and not advanced in condition or value from their natural state