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The book was second edition of 'On the connexion of the physical sciences' written by Mary Somerville published in the year 1835. The book contains 494 (i-xvi) pages. The book describes about astronomy, physics, chemistry, geography, meteorology and electromagnetism as they were scientifically understood at the time.

This fond contains letters, several photographs, and observations related to A. A Narayana Ayer during the year 1913-1920.

This fond contains official letters, photographs, and administrative files related to P. R. Chidambara Ayer during the years 1919-1932.

The fond contains documents of Thomas Royds, the past director of Kodaikanal Solar Observatory. It consists of mainly official letters, administrative documents, pay slips and handwritten documents related to Thomas Royds.

The font contains letters, correspondence, life, achievements and participation at National and International level of Dr.M. K. Vainu Bappu

This fond contains materials related to John Evershed that contains general local office materials including letters of all local government and administrations, proceedings, reports to the government of India etc., A large portion of the collection series contains information on observations from various scientists.

The item deals with the appointment of Thomas Royds as the Director of the Kodaikanal and Madras Observatories, with effect from 26th February 1923 after the retirement of John Evershed. It is mentioned that a copy of the letter was forwarded to the Director-General of Observatories, wide no.524-16, and another copy was forwarded to the Director, Kodaikanal and Madras Observatories, Kodaikanal, for information.

The document contains the appointment details of Thomas Royds as the Acting Director of the Kodaikanal and Madras Observatories during the absence of John Evershed on his deputation to New Zealand.

The office order was about the temporary promotion of Thomas Royds and A. A. Narayana Ayyar. Due to the absence of John Evershed, Director of Solar Physics Observatory, Kodaikanal, The Assistant Director, Thomas Royds, was appointed as Acting Director, and The first Assistant, A. A. Narayana Ayyar, as The Acting Assistant Director. The order was sent from Simla in 1920.

This letter was a copy of an office order was sent by The Director of Ordnance Factories, Calcutta to The Director, Kodaikanal & Madras Observatories, in 1919. The document contains details regarding reuniting with Thomas Royds, Kodaikanal Observatory's Assistant Director, by August 4th, 1919.