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In the preparation of this collection of maps, the best, and especially the most recent ones, published by the Hydrographic Commission have been consulted.

The meridians are given with reference to Greenwich.

For the lineal value of 1 degree of latitude the mean value for the zone of the Philippine Archipelago has been adopted, or 1°=110,000 km.

The original maps are Nos. 1, 2, 3, 4, 5, 6, 13, 16, 17, 24, 25, 26, 27, 28, and 29.

The maps Nos. 7, 9, 10, 11, 12, 14, 15, 18, 19, 21, and 23 are based on those published by D. Enrique de Almonte, with new data.

Map No. 20 is a reproduction of one published by D. Enrique Abella.

Map No. 30 is taken from a plan recently published by the Spanish hydrographic commission.

Map No. 22 is based on one published by D. Enrique Abella, except the detail in the vicinity of Cebu, which is from the Spanish hydrographic commission.

The original maps Nos. 26, 27, and 28 are based on information from the Mission of the Society of Jesus and the maps published by that mission in the Philippines. For the other maps, especially the originals, the information furnished by the missionaries of the other religious orders in the Philippines has been very valuable.