=400 Philology.=
401 Philosophy.
402 Compends.
403 Dictionaries.
404 Essays.
405 Periodicals.
406 Societies.
407 Education.
408 Universal Language.
409 History.
=410 Comparative.=
411 Orthography.
412 Etymology.
413 Dictionaries.
414 Phonology.
415 Grammar.
416 Prosody.
417 Inscriptions.
418 Texts.
419 Hieroglyphics.
=420 English.=
421 Orthography.
422 Etymology.
423 Dictionaries.
424 Synonyms.
425 Grammar.
426 Prosody.
427 Dialects.
428 Texts.
429 Anglo-Saxon.
=430 German.=
431 Orthography.
432 Etymology.
433 Dictionaries.
434 Synonyms.
435 Grammar.
436 Prosody.
437 Dialects.
438 Texts.
439 Dutch and Low German.
=440 French.=
441 Orthography.
442 Etymology.
443 Dictionaries.
444 Synonyms.
445 Grammar.
446 Prosody.
447 Dialects.
448 Texts.
449 Old French, Provençal.
=450 Italian.=
451 Orthography.
452 Etymology.
453 Dictionaries.
454 Synonyms.
455 Grammar.
456 Prosody.
457 Dialects.
458 Texts.
459 Romansh and Wallachian.
=460 Spanish.=
461 Orthography.
462 Etymology.
463 Dictionaries.
464 Synonyms.
465 Grammar.
466 Prosody.
467 Dialects.
468 Texts.
469 Portuguese.
=470 Latin.=
471 Orthography.
472 Etymology.
473 Dictionaries.
474 Synonyms.
475 Grammar.
476 Prosody.
477 Dialects.
478 Texts.
479 Medieval Latin.
=480 Greek.=
481 Orthography.
482 Etymology.
483 Dictionaries.
484 Synonyms.
485 Grammar.
486 Prosody.
487 Dialects.
488 Texts.
489 Modern Greek.
=490 Other Languages.=
491 Chinese.
492 Egyptian.
493 Semitic.
494 Indian.
495 Iranian.
496 Keltic.
497 Slavic.
498 Scandinavian.
499 Other.