578 BIBLIOGRAPHY OF HERSCHEL'S WRITINGS. 



Herschel, W.: Synopsis of the Writings of— Coutinued. 



A. D. Yol. p. 



1801 91 285 lUdijes disperse very soon. Different Causes of Bidges hinted at. 



286 Of Nodules. Nodules are small, hut highly elevated, luminous Places. 



Nodules may be Midges fore-shwtetied. 



287 Of Corrugations. Corrugatimis consist of Elevations and Depressions. 



Corrugations extend all over the Surface of the Sun. 



288 Dispersed Bidges or Nodules make Corrugations. Corrugations change 



their Shape and Situation; they increase, diminish, divide, and vanish 

 quickly. 



289 Of Indentations. The dark places of Corrugations are Indentations. 



290 Indentations are without Openings. In some places the Indentations con- 



tab} small Openings. The Elevations and Indeniations of Corrugations 

 are of different Figures. Indentations change to Openings. 



291 Indentations are of the same Nature as Shallows. Indentations are low 



Places, ivhich often contain very small Openings. Indentations are of 

 different Sizes. Indentations are extended all over the Sun. 



292 With low magnifying Powers, Indentations tvill appear like Points. 



292 Of Pores. The low places of Indentations are Pores. Pores increase 



sometimes, and become Ojienings. Pores vanish quickly. 



293 Of the Regions of solar clouds. 

 Changes in the Solar Clouds happen continually. 



294 There are two different Begions of Solar Clouds. 



The inferior clouds are opaque, and probably not unlike those of our 

 Planet. 



295 Quantity of light reflected from the inferior Planetary Clouds. 



297 Indentations are planetary Clouds, reflecting light through the open Parts 



of the Corrugations. The opaque inferior Clouds probably suffer but 

 little of the light of the self-luminous superior Clouds to come to the Body 

 of the Sun. Motion of the inferior Clouds. 



298 Motion of the superior Clouds. 



299 Eminent Use of the planetary Clouds. 



300 Of the SOLAR atmosphere. The Sun has a planetary Atmosphere. The 



Stin's planetary Atmosphere extends to a great Height. The planetary 

 Atmosphere of the Sun is of great Density. 



301 The Solar Atmosphere, like ours, is subject to Agitations, such as tvith us 



are occasioned by Winds. There is some clear Atmospheiic Space, be- 

 tween the solid Body of the Sun and the lowest Begion of the Clouds. 



302 The Sun's planetary Atmospjhei-e is transparent. 



303 Theoretical explanation of the solar phenomena. 

 Generation of Pores. 



304 Formation of Corrugations. Cause of Indentations. 



305 Cause of the mottled Appearance of the Sun. Formation of small Open- 



ings, Bidges, and Nodules. Production of large Openings and Shal- 

 lows. 



306 Signs of scarcity of luminous matter in the sun. 



Visible Deficiency of empyreal Clouds. A perfect Calm in the upper Be- 

 gions of solar Clouds. Want of Openings, Bidges, and Nodules. 



307 Many Indentations without, and others tvith, changeable Pores. 



308 Signs of abundance of luminous matter in the sun. 



Visible Increase of empyreal Clouds. Many Openings, Bidges, and No- 

 dules. 

 310 Coarse and luminous Corrugations. 



[Each of the above headings is followed by quotations from Her- 

 schel's Journals in confirmation]. 



