The book "An Elementary Treatise on the Lunar Theory with a Brief Sketch of the History of the Problem" was written by Hugh Godfray. Hugh Godfray (c1821-1877) first published his treatise in 1853, a year after he graduated from St. John’s College. Lunar theory would become central to George Darwin’s work, and he went on to form crucial theories regarding lunar acceleration, earth retardation, the earth-moon system, and the genesis of the moon. It was published in 1987

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 seeking a clear spell of an hour in the Sagittarius region and a spectrum of Upsilon Sagittari.

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.