Paper, 'Further experiments on the distribution of micro-organisms in air (by Hesse's method)' by Percy Faraday Frankland and T G Hart Frankland and Hart write: 'In a previous communication entitled “The distribution of micro­organisms in air" a number of experiments have been recorded by one of us on the relative abundance of microbes in the air of various places and of the same place at different times. The numerical determination of the aërial micro-organisms in these experiments was made by means of Hesse’s apparatus, the method of using which was there fully described.' Annotations in pencil and ink. Includes large fold-out graph. Subject: Chemistry / Biology Received 22 November 1886. Read 9 December 1886. A version of this paper was published in volume 42 of the Proceedings of the Royal Society as 'Further experiments on the distribution of micro-organisms in air (by Hesse's method)'. 1887