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

The letter is from Charles Michie Smith to Gilbert T. Walker regarding Pogson's copy of observations. It states that the proposal regarding the copies of Pogson's observations is satisfactory.

The letter is from Charles Michie Smith to the Director General of Observatories Alipore regarding Pogson's copy of observations. It acknowledges the receipt of 18 copies of the late N. R. Pogson's observations of 31 variable stars.

The letter was about acknowledging John Evershed for his invaluable help gave them. Further he was seeking help on two points that, one was having a coolie to climb up the pillar and unclamp and the second was spectrum of Sirius.

The letter is from Gilbert T. Walker to Charles Michie Smith regarding 24 copies of observations by late N.R.Pogson. It states that 24 copies of observations of 31 variable stars by late N.R.Pogson, which was published in England, have been sent out, of which 3 copies are to be kept in Simla and Calcutta each and the rest to be decided by Charles Michie Smith.

This letter was about Beverley Oke research work on Wolf-Rayet stars and V444 Cygni. He was interested read M. K. Vainu Bappu's paper and thesis. He was eloborately discussing his work in this letter.

This letter was about informing Gilbert T. Walker of sending a slide of the Nova Acquilae Spectrum with Arctururs above it for comparison taken at the Kodaikanal Observatory on the night of June 19-20.

This letter was about shifting the Lallemand cell to Kodaikanal that was started out from France as a gift to Dr.Bappu to carry out photoelectric work in the infra-red.

The letter is from Otto Struve, Berkeley Astronomical Department to Dr. V. Bappu, Mount Wilson and Palomar Observatories asking to discuss with Dr. Merrill about Pleione if possble and also asking if he will be intrested to rad the papers by Dr. S. Miyamoto of Kyoto University.

This letter was about two questions that Otto Struve was asking, One is about Pleione and whether the strong lines of Ti II near ? 3759-3761 continued with their normal intensities, relative to the other Ti II lines. The second question is whether he would like to read the enclosed papers by Dr.S.Miyamoto of the Kyoto University.