Solar Prominences

Plate showing gaseous prominences extending from the surface of the sun, as observed through spectroscopy. This phenomenon is introduced as follows by the author:

The chromosphere forming the outlying envelope of the sun is subject … to great disturbances in certain regions, causing considerable upheavals of its surface and violent outbursts of its gases. From these upheavals and outbursts of the chromosphere result certain curious and very interesting forms, which are known under the name of “solar protuberances” “prominences” or “flames.”