Malaria in the Netherlands

LIST OF ILLUSTRATIONS

1. Map of the Netherlands PaSe 2

2. Incidence of malaria at Amsterdam in 1857 and 1922. „ 19

3. Geographical distribution of malaria in 1875 . ... 24

.. .» I9I9 • • 25

5. Annual variation of malaria incidence at Wormerveer. „ 36

6. Focal distribution of malaria at Wormerveer . . „ 45

7. Malaria morbidity in succeeding age-groups . 47

8. Geographical distribution of the long- and shortwinged 6g Anopheles maculipennis . • • • "

9. Distribution of fresh and brackish water through the ^ Netherlands

10. Anopheline density in the Netherlands . . ?r Plate I. Normal and hybrid sexual organs of K.

maculipennis type tac™s

11. Seasonal incidence of shortwings in an open shelter . Page 94

12. Seasonal incidence of shortwings in human habitations. „ 95 1, Annual fluctuations of the number of shortwings

during autumn in relation to temperature

14. Distribution of salty and fresh water in some coastal i2Q provinces

15. Distribution of shortwing and longwing larvae in the same provinces

16 Periodicity of anopheline infection

Plate II. Salivary glands of long- and shortwings dunng

hibernation and semi-hibernation. - Normal^and ^

degenerated sporozoites

17. Inverse relation of sporozoite-rate to rate of pregnant ^ ^ females

18. Sporozoite-rate and percentage of females having ^

imbibed hiiman blood •

19. Infectivity of malaria patients and healthy carriers . „ 171

20. Simple tertian turning duplicate .

21. Quotidian converted into tertian by 50 milligrammes ^ of neosalvarsan.

22. Quartan not susceptible to neosalvarsan 4

23. Triplicate quartan converted into simple quartan . „ 247