Fig. 27. February 10, 1836. 



Fig. 29. February 23, 1836. 



HALLEY'S COMET DEPARTING FROM THE SUN IN 1836. 



COMETS. 



CHAPTEE IV. 



84. Light or comets. 85. Enlargement of magnitude on departing from 

 the sun. 86. Professor Struve's drawings of EnckS's comet. 87. 

 Remarkable physical phenomena manifested by Halley's comet. 



88. Struve's drawings of the comet approaching the sun in 1835. 



89. Its appearance on the 29th of Sept. 90. Appearance on Oct. 3. 

 91. Appearance on Oct. 6. 92. Appearance on Oct. 9. 93. Ap- 

 pearance on Oct. 10. 94. Appearance on Oct. 12. 95. Appearance 

 on Oct. 14. 96. Appearance on Oct. 29. 97. Appearance on Nov. 5. 

 98. Sir J. Herschel's deductions from these phenomena. 99. Ap- 

 pearance of the comet after perihelion. 100. Observations and 

 drawings of MM. Maclear and Smith. 101. Appearance on Jan. 24. 

 102. Appearance on Jan. 25. 103. Appearance on Jan. 26. 104. 

 Appearance on Jan. 27. 105. Appearance on Jan. 28. 106. Ap- 

 pearance on Jan. 30. 107. Appearance on Feb. 1. 108. Appearance 

 on Feb. 7. 109. Appearance on Feb. 10. 110. Appearance on 

 Feb. 16 and 23. 111. Number of comets. 112. Duration of the 

 appearance of comets. 113. Near approach of comets to the earth. 



84. THAT planets are not self-luminous, but receive their light 

 from the sun, is proved by their phases, and by the shadows of 

 LARDNER'S MUSEUM OF SCIENCE. o 193 



No. 142. 



