BIBLIOGRAPHY OF HERSCHEL's WRITINGS. 577 



Herschel, W.: Synopsis of tiik "VVkitixgs of— Continnea. 

 A. D. Vol. r. 



1800 90 533-534 Method of determination. 



534-535 Table VIII. Containing the relative scattering power of thirty- 

 three bodies. 

 535-538 Explanation of the Platex. 



1801 91 205 Observations icndintj to investigate the Xature of the Sun in order to find 



the Causes or Sijinjitoins of its variable Emission of Li{fht and Heat; 

 with Bemarks on the Use that may possibly be dratvn from Solar Obser- 

 vations. By William Heijschel, LL. D., F. R S. Read April 16, 

 1801. 



265-266 Reference to Herschel's view, given on a former occasion, that 

 the sun is a magnificent habitable globe ; declaration that these more 

 recent observations support that view; and a statement as to the 

 importance of solar observations in their bearing upon the climate, 

 together with an opinion that such observations will enable us to 

 predict the character of a season. 



267-268 Definitions of the terms, openings, shallows, ridges, nodules, corru- 

 gations, indentations, and pores. 



269 Exx)lanatiou of the form of the paper and the reasons for it. 



270 Of openings. Openings arc Places ivhere the luminous Clouds of the Sun 



are removed. 

 [Foot-note.] For a geometrical proof of the depression of openings 

 a reference to a paper by Alexander Wilson, Phil. Trans,, vol. 

 64. 



271 Large Openings have generally ShalJows about them. Many Openings are 



without Shallotvs. Small Openings are genei-ally without Shalloivs. 

 Openings have generally Ridges and Nodules about them. 



272 Openings have a Tendency to run into each other. Neiv Openings break out 



near other Openings. Probable Cause of Openings. 



273 Direction and Operation of the disturbing Cause. 



274 Maxima of Openings. 



275 There is some Difference in the colour of Openings. Openings divide rvhen 



they are decaying. 



276 Decaying Openings sometimes ino'case again. When Openings are divided 



they grow less and vanish. Decayed Openings sometimes become large 

 Indentations. 



277 Decaying Openings turn sometimes into Pores. When Openings are van- 



ished, they leave Disturbance behind. 



278 Apparent Vieio into the Openings, under luminous liidgcs and Shalloivs. 

 Depth of the Openings indicated by their Darkness. 



279 Distance between the Shalloivs and solar Surface, indicated by the free 



Motion of low Clouds. 



280 Of Shallows. Shallows are dejyressed below the general Surface of the 



Sun; and are Places where the luminous solar Clouds of the upper Re- 

 gions are removed. The Tliickncss of the Shallows is visible. 



281 Sometimes there arc Shalloivs tvithout Openings in them. Incipient Shalloivs 



come from the Openings, or branch out from Shallows already formed, 

 and go forwards. Probable Cause of Shallows. 

 283 Shallows have no Corrugations, but are tufted. Decay of Shallows. 



283 Of Ridges. Ridges are Elevations above the general Surface of the lu- 



minous Clouds of the Sun. 



284 Length of a Ridge. Ridges generally accompany Openings. Ridges are 



also often in Places where there are no Openings. 

 S. Mis. 31 37 



