FILARIAL PERIODICITY 



119 



VouSo 



FIG. 52. Showing nocturnal periodicity, China. (After Manson.) 



VMBtf 





FIG. 53. Diurnal periodicity, West Africa. (After P. H. Bahr.) 



FIG. 54. Absence of periodicity, two cases, Fiji. (After B. M. Wilson.) 



APRIL 1910 



PJW, 



FIG. 55. Number of filarial embryos in I c.mm. of blood in a Fijian. 

 Absence of definite periodicity. (After P. H. Bahr.) 



