FOSSIL POLYCYSTINA Si 



experienced after one peep at the real thing through 

 the microscope. 



Instead of purchasing a slide, it is more satisfactory 



Fig. 16. Polycystina. The composition of the Rocks of Barbados. 

 Enlarged several hundred diameters. 



to prepare the specimens direct from the 'raw mate- 

 rial.' To do this it will be necessary to obtain a piece 

 of the rock from some friend living in that part of 



F 



