=======================+===================== | WIDTH +------+-------+------ | 1903 | 1905 | MEAN -----------------------+------+-------+------ 1. Phison | 3.5 | 3.4 | 3.4 2. Euphrates | 4.0 | 4.2 | 4.1 3. [*]Protonilus | 2.8 | 2.0 | 2.4 4. Deuteronilus | 2.2 | 2.4 | 2.3 5. Pierius | 2.5 | -- | 2.5 6. Callirrhoe | 2.5 |[*]2.1 | 2.3 7. [*]Hiddekel | 3.8 | 4.9 | 4.3 8. [*]Gihon | 3.9 | 4.9 | 4.4 9. Djihoun | 2.0 | 1.9 | 1.9 10. Sitacus | 3.8 |[*]3.3 | 3.6 11. Jamuna | 4.5 | -- | 4.5 12. Ganges | 5.0 | 5.2 | 5.1 13. Nilokeras I and II | 11.0 | 11.7 | 11.3 14. Nilokeras I | 2.3 | -- | 2.3 15. Gigas | 3.5 | -- | 3.5 16. Laestrygon | 2.2 | -- | 2.2 17. Cerberus N. | 4.0 | -- | 4.0 18. Cerberus S. | 4.0 | -- | 4.0 19. Cyclops | 2.9 |[*]2.2 | 2.6 20. Nar | 2.6 | 2.0 | 2.3 21. Fretum Anian | 2.8 | -- | 2.8 22. Aethiops | 3.3 | -- | 3.3 23. Eunostos | 2.8 | -- | 2.8 24. Lethes | 2.9 | -- | 2.9 25. Marsias | 3.2 | -- | 3.2 26. Hyblaeus | 3.0 | -- | 3.0 27. Amenthes | 3.2 | 3.5 | 3.3 28. Thoth | 2.8 | 2.3 | 2.5 29. Nepenthes | 2.8 | 2.3 | 2.5 30. Triton | 2.7 |[*]2.3 | 2.5 31. Pyramus | 2.9 |[*]2.0 | 2.5 32. Astaboras S. | 3.2 | 3.1 | 3.1 33. Tithonius | 2.6 | 2.2 | 2.4 34. Vexillum | 3.5 | 2.9 | 3.2 35. Tartarus | -- | 2.7 | 2.7 =======================+======+=======+====== [*] Poor. Here we have widths ranging from eleven degrees to two. The widths given are those when the canal was at or sufficiently near its full strength, and are measured from the centres of the constituents. We notice two points: the agreement of the same canal with itself and its systematic disagreement with others. But what is especially to the point, if we compare the values found at successive oppositions, we find that for different canals the values agree in their difference. This shows that each of these values is, in most cases if not in all, a norm for that particular canal; a value distinctive of it and to which it either absolutely or relatively conforms. In other words, the width of the gemination is a personal peculiarity of the particular canal, as much an idiosyncrasy of it as its position on the planet.