I addrest myself to Warburg's drops (_Tinctura Warburgii_), a preparation invaluable for travellers in the tropics and in the lower temperates. The action appears to be chiefly on the liver through the skin. The more a traveller sees, the firmer becomes his conviction that health means the good condition of this rebellious viscus, and that its derangement causes the two great pests of Africa, dysentery and fever. Indeed, he is apt to become superstitious upon the subject, and to believe that a host of diseases--gout and rheumatism, cholera and enteric complaints--result from, and are to be cured or relieved only by subduing, hepatic disturbances. My 'Warburg' was procured directly from the inventor, not from the common chemist, who makes the little phialful for 9_d._ and sells it for 4_s._ 6_d_. Some years ago a distinguished medical friend persuaded Dr. Warburg, once of Vienna, now of London, to reveal his secret, in the forlorn hope of a liberal remuneration by the Home Government. Needless to say the reward is to come. I first learnt to appreciate this specific at Zanzibar in 1856, where Lieut.-Colonel Hamerton used it successfully in the most dangerous remittents and marsh-fevers. Cases of the febrifuge were sent out to the Coast during the Ashanti war for the benefit of army and navy: the latter, they say, made extensive use of it. I have persistently recommended it to my friends and the public; and, before leaving England in 1879, I wrote to the 'Times,' proposing that all who owe (like myself) their lives to Dr. Warburg should join in relieving his straitened means by a small subscription. At this moment (June 1882) measures are being taken in favour of the inventor, and I can only hope that the result will be favourable. The 'drops' are composed of the aromatic, sudorific and diaphoretic drugs used as febrifuges by the faculty before the days of 'Jesuits' bark,' to which a small quantity of quinine is added. Thus the tincture is successful in many complaints besides fevers. Evidently skilful manipulation is an important factor in the sum of its success. Dr. Warburg has had the experience of the third of a century, and the authorities could not do better than to give him a contract for making his own cure. The enemy came on with treacherous gentleness--a slight rigor, a dull pain in the head, and a local irritation. 'I have had dozens of fevers, and dread them little more than a cold,' said Winwood Reade; indeed, the English catarrh is quite as bad as the common marsh-tertian of the Coast. The normal month of immunity had passed; I was prepared for the inevitable ordeal, and I flattered myself that it would be a mild ague, at worst the affair of a week, Altro!