Minutes of Proceedings. xiii 



Dr. Ashley-Emile. The larva extracted from Livingstone's leg 

 by his companion, Dr. J. Kirk — later on Sir John Kirk — was given 

 by him to Cobbold, and deposited by the latter in the Collection of 

 the Eoyal College of Surgeons. It has been figured by Blanchard, 

 and the drawings were exhibited. 



A paper, " Notes on Semicirculants," by Thos. Muie, LL.D., was 

 read. 



Dr. Mabloth read a short paper on " Further Observations on 

 Mimicry among Plants,*' from which he draws the conclusion that 

 those plants which are best hidden on the bare veld owing to their 

 colour and shape have the best chance of escaping destruction, 

 while others which are more conspicuous on the ground will be 

 more readily detected and eaten up, and that the theory of 

 coincidences is hardly admissible. 



Mr. J. Stewart read an abstract of a paper by J. E. Sutton 

 on "The Variation of the Hourly Meteorological Normals at 

 Kimberley during the passage of a Barometric Depression." 



He stated : This paper is the result of an attempt : (1) to 

 determine the variation of the hourly normals of the more important 

 meteorological elements at Kimberley introduced by the passage of 

 a barometric depression ; and (2) incidentally to learn something 

 of the conditions prevailing in the depression itself. The in- 

 vestigation is based almost entirely upon observations made at a 

 single station, information suitable for the construction of synoptic 

 charts not being available. 



The ordinary depression may last any time from a day to a week, 

 and the winds generated may blow with any velocity up to 35 miles 

 an hour, and perhaps to 50 miles an hour in occasional gusts. 

 When they first become noticeable to all by reason of the strength 

 of the wind, they set in with warm and discomforting gusts from 

 the North or North-west, and pass away with cool, steady winds 

 from South-west or South. They often bring light showers, but 

 not often heavy rain. Frequently the approach of the centre or 

 trough is heralded by clouds of dust ; but it is remarkable that 

 equally strong winds in the rear of the centre seldom raise any dust 

 to speak of. 



A selection of 105 depressions has been made from those which 

 passed over Kimberley in the six years, 1898-1903, and the hourly 

 changes of pressure, temperature, vapour-tension, rain, and wind, 

 in them compared with the normal averages of the same elements. 

 The paper being chiefly preliminary to a more extended treatment 

 later on, no distinction at this stage has been thought necessary 

 between the different types of depression. 



