vm 



CONTENTS. 



10. Of the analogy between light and sound; 541. ii. Of 

 the coalescence of musical sounds; 544. 12. Of the fre- 

 quency of vibrations constituting a given note; 545. 13. 

 Of the vibrations of chords ; 546. 14. Of the vibrations of 

 rods and plates, is. Of the human voice ; 549. 16. Of 

 the temperament of musical intervals; 551. Explanation 

 of plate 2 . . 7 ; 553. 



III. An essay on cydoidal curves^ with 

 introductory observations; 555. 



1, On mathematical symbols; 555. 2. On cycloidal 

 curves; 558. 



IV. An e.'^say on music ; 563. 



1. Of music in general; 563. 2. Of the origin of the 

 scale; 566. 3. Practical application of the scales; 568. 

 4. Of the terms expressive of time ; 571. 



V. The Bakerian Lecture for 1800. On 

 the mechanism of the eye ; 573. 



1 . Changes of opinions respecting the crystalline lens ; 

 S73. a. Division of the subjects to be investigated. 3. 

 General consideration of the sense of vision ; 574. 4. 

 Description of an optometer; 575. 5. Dimensions and 

 powers of the author's eye ; 57 8. 6. Extent of the changes 

 required for the accommodation of the eye ; 585. 7. Exa- 

 mination of the state of the cornea ; 586. 8. Examination 

 of the length of the axis; 589. O- Examination of the 

 changes of the lens; 592. 10. Anatomical remarks on 

 the eyes of different animals; 597- Explanation of plate 

 8. . 13; 604. 



VI. A letter to Mr. Nicholson, respecling 

 sound and hght, and in reply to some obser- 

 vations of Professor Robison ; 607. 



Heads of the paper on sound and light ; 607. Remarks 

 on Smith's harmonics ; 609. On temperament ; 610. 



VII. The Bakerian lecture for 1801. On 

 the theory of light and colours; 6l3. 



Excellence of Newton's experiments ; 613. Hypothesis 



of an elastic ether; 614. Undulations; ai5. Cofours ; 

 616. Constitution of material bodies; Transmission of 

 impulses; 618. Spherical divergence; 6I9. New di- 

 vergence; 620. Partial reflection; 622. Refraction ; Total 

 reflection; Dispersion; 623. Combination of undulations ; 

 624; Striated surfaces; 625. Thin plates; 62S. Thick 

 plates; 628. Inflection; General conclusion respecting 

 the nature of light ; Iceland crystal ; 629. Momentum of 

 light ; Solar phosphori ; 630. Heat ; Experiment pro- 

 posed ; 631. Plate 14; 632. 



VIII. An account of some cases of the 

 production of colours not hitherto described ; 



633. 



General law of double lights ; Colours of fibres ; 633. 

 Colours of mixed plates ; fijs. Internal reflection ; 638. 

 Dispersion; Dr. WoUaston's experiments ; 637. Blue light 

 of a candle ; Dispersive powers of the eye ; 638. 



IX. The Bakerian lecture for 1803. Ex- 

 periments and calculations relative to physi- 

 cal optics ; 639- 



1. Experimental demonstration of tht general law of the 

 interference of light; 639. 2. Comparison of measure* 

 deduced from various experiments; 640. 3. Application 

 to the supernumerary rainbows ; 643; 4. Argumentative 

 inference respecting the nature of light; 645. 5. Remarks 

 on the colours of natural bodies ; 646. Experiment on the 

 dark rays of Ritler; 647. 



X. An essay on the cohesion of fluids ; 

 649. 



1. General principles; 649. 2. Form of the surface of a 

 fluid; 649. 3. Analysis of the simplest forms; 650. 4. Appli- 

 cation te the elevation of particular fluids ; 651. i. Of ap- 

 parent attractions and repulsions ; 655. 6. Physical foun- 

 dation of the law of superficial cohesion ; 657. 7. Cohe- 

 sive attraction of solids and fluids; 658. 8. Additional. 

 Extracts from Laplace, with remarks; 6«o. Plate 15; 670. 



ACCOUNT OF THE PROCEEDINGS OF THE ROYAL SOCIETY, FROM NOVEMBER 



1801 TO JULY 1802; 67I. 



INDEX ; 683. 



