138 



JOHN S. BARLOW 



MULTIPLE SCLEROSIS 



1.0 « I.ei DEATHS PER 100,000 POP. PER YEAR 



GEOGRAPHIC LATITUDE °N OR S 



20 30 40 50 



GEOMAGNETIC LATITUDE °N OR S 



HODGKIN'S DISEASE 



l.O = 1.45 DEATHS PER 100,000 POP. PER YEAR 



10 20 30 40 50 60 70 



CtOCRAPnC LATITUDE °N OR S 



K> 20 30 40 so 60 70 



CEOMACNETIC LATFTUDS °N OR ( 



Fig. 8. Latitude distribution of multiple sclerosis and Hodgkin's disease by relative 

 mortality rates (see Table VI). 



