Tape-worms have a very curious life-history. The long, flat, jointed strip is really a chain of sexually mature individuals, but when their eggs are swallowed by an animal there is hatched out from it, not another tape-worm, but a minute embryo, which has the power of boring through the tissues of its host till it reaches some favourable resting-place, where it settles down, protected by a capsule, forming what is known as a bladder-worm. It may live for years in this condition, but cannot reach maturity until the capsule has been swallowed by some carnivorous animal, though some species can multiply non-sexually and so cause terrible damage to the animal that harbours it. Both stages of several species of these parasites infest man, but fortunately their prevention is a very simple matter, at any rate as far as the adult strings of worms are concerned, as infection is impossible provided all meat and fish eaten be thoroughly cooked. The mature stage of the bladder-worm which is found infesting man inhabits the intestine of the dog, and as it is capable, in this stage, of non-sexual multiplication, may give rise to large tumours, the effects of which may be most serious if a vital organ be invaded. Though almost a medical curiosity in Europe, it constitutes a really serious danger in certain pastoral colonies, such as Australia, where large numbers of dogs have to be kept for herding sheep, and are allowed unrestricted access to the offal of carcases, which is, of course, very abundant where meat-preserving is an important industry. The disease might be guarded against by preventing the dogs having access to anything but thoroughly cooked meat, and by avoiding undue fondling and too close association with these animals. The third important class of parasites, the flukes, but rarely infest man, but in Egypt and, in fact, throughout Africa, a peculiar fluke, the _Bilharzia_, is found infesting the blood-vessels, especially those of the kidney, and gives rise to the appearance of blood in the urine. It is extremely common amongst the natives of Egypt, but it very rarely attacks Europeans, and though we are quite in the dark as to its life-history outside the human subject, there is little doubt that moderate care as to the water used for drinking and bathing is sufficient to afford complete protection against the disease. PART II. OUTLINES OF TROPICAL CLIMATOLOGY ERRATA. p. 9, line 9 from foot, _for_ “Camerun” _read_ “Cameroon”; and line 12 from foot, _for_ “Shilling” _read_ “Shillong.” p. 58, line 11 from foot, _for_ “Sangor” _read_ “Saugor.” p. 63, in table, line 11 from top, _for_ “Ayra” _read_ “Agra.” p. 84, line 1 in table, and p. 85, line 3 in table, _for_ “Mazattan” _read_ “Mazatlan.” OUTLINES OF TROPICAL CLIMATOLOGY. SECTION I. General Considerations.