This fond includes an introduction exploring the Sun's significance in relation to life and activities on Earth. Additionally, it comprises five chapters covering topics such as the distance and dimensions of the Sun, methods and apparatus for studying the Sun's surface, the spectroscope and solar spectrum, and an examination of sunspots. The book is part of International Scientific Series, Vol. XXXIX

This letter was about the requesting to send the photographs of the Sun for some dates in 1905.

This letter was about the list of photographs of Sun taken on different dates and at particular times mentioned.