NOTES AND REFERENCES. 463 



PAGE 



172. DULONG and PETIT, Relation between Specific Heat and Chemi- 

 cal Equivalents (Ann. de Ch. et de Phys., torn. x. p. 395). 

 NEUMANN, PoggendorfFs Annalen., Bd. xxiii. p. i. 

 AVOGADRO, Ann. de Ch. et de Phys., torn, Iv. p. 80. ' 



NOTES AND REFERENCES 



TO" 

 CONTINUITY. 



1 86. HERSCHEL, Sir J., Astronomical Observations at the Cape of 



Good Hope, 1847. 



WROTTESLEY, Lord, On Double Stars, Phil. Trans. 1851 ; Proc. 

 R. S. 1849. 



ROSSE, Earl of, Observations on the Nebulas (Phil. Trans. 1850, 

 p. 499). 



187. OLMSTED, Silliman's Journal, July 1834, p. 138. 



The first suggestion of a perspective vanishing-point for meteors 

 seems to be due to Professor Thomson, of Nashville. 



HERSCHEL, ALEXANDER, Reports of the Meteor Committee of 

 the British Association. 



SORBY, Idem, and Proc. R. S. June 16, 1864. 



BRAYLEY, Idem, 1865, p. 140, and Proc. R. S. March 23, 

 1865. 



1 88. LEVERRIER, Intra-Mercurial Planets (Comptes rendus, Paris, 



1861, p. 1109). 



DAUBREE, Comptes rendus, Paris, 1866 (Bulletin de la Societe 

 Geologique de France, Mars 1866). 



190. PLUCKER, Variation of Spectrum Lines with Temperature 



(Phil. Trans. 1865, p. 6). 



191. HUGGINS and MILLER, Spectra of Fixed Stars (Phil. Trans. 



1864, p. 413). 



Spectrum of Temporary Star (Proc. R. S., No. 84, 1866). 



