+-----------------+---------+---------+---------+---------+--------+ | Station. | Winter. | Spring. | Summer. | Autumn. | Annual.| +-----------------+---------+---------+---------+---------+--------+ |Littoral: | | | | | | | Nemours | 2.69 | 44.09 | 24.1 | 7.4 | 3.0 | | Cape Falcon | 1.83 | 8.75 | 58.6 | 16.3 | 3.7 | | Oran | 2.54 | 3.7 | 71.0 | 7.95 | 4.2 | | Algiers | 1.0 | 7.96 | 86.4 | 2.44 | 1.8 | | Bouzarea | 0.58 | 3.0 | 28.5 | 1.45 | 0.93 | | Maison-Carée | 0.62 | 5.0 | 117.4 | 1.48 | 1.5 | |Tell: | | | | | | | Ft. National | 0.39 | 1.4 | 83.2 | 1.67 | 1.1 | | Sidi-bel-Abbès| 0.73 | 8.2 | 38.3 | 6.0 | 2.2 | | Saida | 0.69 | 1.0 | 3.5 | 3.9 | 1.9 | | Batna | 1.8 | 2.1 | 0.35 | 3.6 | 4.4 | | Tebessa | 4.7 | 4.05 | 88.2 | 2.8 | 6.0 | |High Plateau: | | | | | | | Bou Saada | 5.9 | 7.0 | 76.0 | 9.2 | 11.0 | | Barika | 4.1 | 6.6 | 93.5 | 35.2 | 12.2 | | Ain Sefra | 1.4 | 12.5 | 67.9 | 18.5 | 11.1 | | Geryville | 7.0 | 9.8 | 20.8 | 3.2 | 3.5 | |Desert: | | | | | | | Laghouat | 6.0 | 73.2 | 271.6 | 64.6 | 17.0 | | Ghardaia | 154.9 | 416.3 | 293.7 | 195.9 | 59.7 | | El Oued | 68.3 | 354.0 | 485.2 | 109.5 | 63.0 | +-----------------+---------+---------+---------+---------+--------+ When we reduce the evaporation-rainfall ratios of the different physiographic provinces to simple expressions we gain a comprehensive view of this important climatic factor for the colony as a whole. Thus the annual evaporation-rainfall ratios are as follows: the littoral, 2.5; the Tell, 3.5; the High Plateau, 9.4; the desert, 46.5. The relation of these expressions may also be given thus: 1:1.4:3.7:18.6, for the several regions above given, by which we see how rapidly the aridity of the country increases as the desert is entered. The present custom of considering the southern base of the Sahara Atlas as the northern edge of the desert, in place of including the High Plateau, as was done earlier, is thus well grounded.