This letter discusses on the predicted formula about the shifts of the solar lines in agreement with the observed values at the red end of the spectrum.

This letter was to replying Dr.M. K. Vainu Bappu for telling the improvements required in the spectra for H & K emission.

The item was about the original glass plate that recorded the "Evershed Effect" in 1909.

The fond contain correspondance of M. K. Vainu Bappu with C. V. Raman and mentors, donated by Mrs. Yemuna Bappu to IIA archives.

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

This item concerns about the rare white light flare recorded in hydrogen alpha at Kodaikanal Observatory. These observations were taken on photographic films or plates and digitized for scientific research purposes.