The Trade-winds--The monsoons--Theory of the Trade-winds--Explanations--Tropical winds--Motion of cold air--Direction of clouds--Equatorial Trades--Calms and variables--South-east Trades--Application of theories--Atlantic winds--Monsoons of India--Trade-winds of the pacific--Monsoons of Indian seas--Velocity of equatorial air--Obstructions of the land--Horsburg's remarks--Dampier's essay.