PROCEEDINGS 



OF THE 



Camfrrifygpe ||{jril0S0p{waI Society, 



On Semi-convergent Series. By Mr W. M C F. Orr. 



[Read 30 October 1899. v. Transactions Vol. xix.] 



An Experiment on the Condensation of Clouds. By Mr C. T. R 

 Wilson. 



[Read 30 October 1899.] 



The author gave an experimental demonstration of the pro- 

 duction of cloud by the contact of layers of moist air of different 

 temperatures. 



The Skeleton of Astrosclera compared with that of the Phare- 

 tronid Sponges. By Mr J. J. Lister. 



[Read 13 November 1899.] 



The structure of Astrosclera willeyana, the representative of a 

 new family of Sponges, obtained by Dr Willey in the Loyalty 

 Islands, was described, and attention was drawn to the resemblance 

 between its skeleton and that of some members of the Pharetrones, 

 a group of sponges which are found as fossils in formations ranging 



VOL. X. PT. IV. 14 



