Transcriber’s notes: The text of this e-book has been preserved in its original form apart from correction of a few typographic errors (omposition → composition, recal → recall, gives → give, bloodvessels → blood vessels), and insertion of some missing quotation marks. Inconsistent hyphenation and inconsistent spelling (Scheld/Scheldt/Sheldt) has not been altered. Footnotes have been numbered and positioned below the relevant paragraphs. AN ENQUIRY INTO THE ORIGIN AND INTIMATE NATURE OF MALARIA. By THOMAS WILSON, CHEVALIER DE L’ORDRE DU LION NEERLANDAIS. LONDON: HENRY RENSHAW, 356, STRAND. 1858. LONDON: SAVILL AND EDWARDS, PRINTERS, CHANDOS STREET, COVENT GARDEN. TO M. ROCHUSSEN, MINISTER OF COLONIES AT THE HAGUE. SIR,-- I have taken the liberty of dedicating this little work to you. It treats of a subject on which I have made many experiments and collected many observations in Belgium and in Holland. I have carefully weighed the conflicting evidence of some distinguished observers, and the conclusion arrived at is, that this conflict has arisen partly from a want of due care in making the observations, partly from the extreme difficulty accompanying all inquiries in which physiology and pathology, health and disease, are necessarily involved.