Reviews and use of the first edition as the textbook for a senior-division uni- versity course indicated the need for a number of corrections and clarifica- tions. Although no new topics have been introduced, the new edition should be more clear and useful. A novelty in the Notes and Sources Appendix should facilitate reference from the notes back to the text. Far that purpose, the page number of the text to which each note refers is indicated in square brackets following the serial number of the note. The FMC1 color-difference formula has been substituted everywhere for the Friele-MacAdam...