Minute* of Proceedings, ix 



boulders showing glacial striae, discovered by Mr. Dunn in the bed of 

 the Vaal Eiver, and at present in the Albany Museum. 



Dr. Mum made an appeal to the Society to have demonstrations 

 of new and remarkable discoveries in science repeated here. For 

 instance, a discovery had recently been made that if a photograph 

 be taken with an ordinary dry plate, against which a screen was 

 placed covered with fine lines, some four hundred to the inch, coloured 

 alternately red, orange, and blue, and the dry plate developed in the 

 ordinary way, then if this plate be put in a lantern and projected 

 on a screen, it looked like an ordinary photographic negative ; but 

 when the screen was placed over it, the picture was seen to be 

 coloured exactly as in nature, thus affording a most beautiful illus- 

 tration of Clerk-Maxwell's theory of the three fundamental colours 

 in nature. 



Again Professor Eontgen's discovery could be so easily repeated, 

 that very little expense was sufficient to enable us to see for our- 

 selves this truly wonderful discovery. 



Dr. van dee Eiet read a paper on the Dolerites of South Africa. 



Ordinary Monthly Meeting. 



Wednesday, March 25, 1896. 

 Mr. T. Muir, LL.D., M.A., F.E.S. Edin., President, in the Chair. 



Messrs. A. W. Eogers, B.A., and A. P. Trotter, B.A., were duly 

 elected ordinary members of the Society. 



The undermentioned presents were announced, and the thanks of 

 the Society voted to the donors : 



Journal of the Manchester Geographical Society, Vols. II. , III., 

 VI, VII. , VIII., IX. 



Jahrbuch der Hamburgischen Wissenschaftlichen Anstalten, Jahr- 

 gangs, I. -XII. 



Das Grundwasser in Hamburg, Parts 1, 2, 3. 



Annales de l'lnstitut Colonial de Marseille, 3rd year, 2nd vol. 

 (1895). 



Bulletin de la Societe Imperiale des Naturalistes de Moscou, 1895, 

 No. 3. 



Bulletin du Museum d'Histoire Naturelle, 1895, Nos. 1, 8. 



Memoirs and Proceedings of the Manchester Literary and Philo- 

 sophical Society, Vol. IX., Nos. 3, 4, 5. 



Proceedings and Transactions of the Nova Scotian Institute of 

 Science, Vol. VIII. , Part 4. 



