This letter addressed on the annual report on solar physics to be submitted by either C. M. Smith or Walker before the board of scientific advice takes place in early October. Further the letter mentioned on the results regarding to spectra and new series with a title of 'Indian Astronomical Memoirs'.

This letter was a request regarding the present state of knowledge about the periodocity of sun spot activity.

The letter was an reply to Mrs. John Evershed saying that you enquired of my assistant about the name of "Evershed" as applied on lunar crater. Further he mentioned about its co-ordinates and enclosed the portion of the NASA map showing the crater named to it.

This is a letter from Charles. P. Butler, Ag: Director, Kodaikanal & Madras Observatories to Executive Engineer Madura regarding some construction needs at the Solar Physics Observatory, like a permanent building to hold the 4-inch photoheliograph, a glazed verandah for keeping the north-western side of the observatory dry, an open verandah for the Bookbinder's shed and quarters for the writer of the observatory, on which the details will be given later when the decision is finalised.

The letter was from Charles P. Butler to John Eliot the Meteorological Reporter to the Government of India and Director General of Indian Observatories, Simla, in 1903. The letter is about increasing the power of the apparatus used for sun-spot spectra of Kodaikanal Observatory.

This letter was about the conversations of C. M. Smith on sunspot article.

This letter was to inform on M. K. Vainu Bappu's research on Sun. It also mentioned finding a location for the Solar Physics Observatory and also asking Bappu for the present address of Zeiss and of Cox, Hargreaves and Thomson.

The letter is from Astronomer Royal, Royal Observatory, Greenwich, London, to The Director, Kodaikanal Observatory, Madras, India, requesting to send solar photographs of the mentioned dates as the photographs taken from there are deficient.

This Letter is from Astronomer Royal to the Director regarding sun photographs for 1911 May 19 and 20

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.