JoLY AND SnyTH — Amount of Radium Emanation in the Soil. 153 



Table I. 



Eocperiments in grounds of Trinity College, Bitb/iii. 



Experiments of the same character were begun near Milltown, Co. Dublin, 

 about two miles south of the College, in a tennis-court at Somerset House. 

 In these experiments the tube was consistently kept at a depth of 25 cms. 

 Its position in the tennis-court was, however, occasionally varied. The soil 

 is here not very different in character from that of the College, but is less 

 blackened by atmospheric impurities. It is essentially calcareous, but is not 

 so pervious beneath as the College soil. A close and heavy sub-soil comes 

 within a metre of the surface ; tlie depth before rock is met must, however» 

 be very considerable. It will be seen from the adjoining Table that the 

 ejnftnation richness of this soil greatly exceeds that of the College Pari?. 



