The generic name of Trypanosoma was conferred by Gruby in 1843 upon the wellknown,Perhaps the converse is more feasible in some circumstances - that is to say, preventing mosquitoes from having access to malarial persons, and so propagating the,The parasitic hypothesis postulates the invasion of a,palpalis, of Equatorial Africa, whose bite transmits the human,Adaptive characters are often hereditary, for instance, the seed of a,Before the end of the 19th century this discovery of the blood,In the case of oxen the alternate host of the,The male, however, is a veritable pigmy beside the female, and during copulation presents the appearance of a,For some of these, as redwater (pyrosoma), antidotes are already found; for others, as for Texas fever - of which the,Thus we get a complete scientific demonstration of the causation of malaria in three stages: (1) the discovery of the,The itch-insect (Sarcoptes scabiei) is a well-known human,In 1898 it was conclusively shown in Italy that if a mosquito E of the Anopheles variety bites a person suffering from malaria, and is kept long enough for the,6) has a good deal to tell about the viscum, a deadly,In the case of filariasis due to Filaria bancrofti, which is common throughout the Tropics, the embryos of the,In scabies (itch) it is the best remedy, killing the male,demonstrated by a series of accurate investigations, contributed by many workers, that malaria is caused by a microscopic,In 1894 (Sir) David Bruce discovered the celebrated South African,In dealing with disease-causing forms, the more narrowly the original source of the,It must not be overlooked that the living cells of the plant react upon the,The old age of Trembecki appears to have been ignoble and neglected; he had indeed "fallen upon evil days and evil tongues"; and when he died at an advanced age all the gay courtiers of whom he had been the,It is important to note that although sleeping sickness (of which the chief foci are at present the Congo Free State and Uganda) has hitherto been associated with one particular species of Glossina, it has been shown experi mentally both that other tsetse-flies are able to transmit the,By this time the embryo has all the organs of the adult perfected save only the reproductive; these develop only when the first host is swallowed by the second or final host, in which case the,18, Bureau of Plant Industry, U.S. Department of Agriculture), who attributes it not to any specific,It is one thing to protect individuals from mosquito bites, another to prevent the propagation of the,The animal cell can absorb its carbohydrate and proteid food only in the form of carbohydrate and proteid; it is dependent, in fact, on the pre-existence of these organic substances, themselves the products of living matter, and in this respect the animal is essentially a,The human flea is considerably exceeded in size by certain other species found upon much smaller hosts; thus the European Hystrichopsylla talpae, a,The female is viviparous, and the young, which, unlike the parent, are provided with a long tail, live free in water; it was formerly believed from the frequency with which the legs and feet were attacked by this,Numerous wild hypotheses as to changes in the constitution of the host-plant, leading to supposed vulnerability previously non-existent, would probably never have seen the light had the full significance of the truth been grasped that an epidemic results when the external laciors favor a,The labours of Golgi, Marchiafava, Celli and others established the nature of the,The attention of birds is speedily attracted to the snail by this appearance and by the peculiar movements which the worm executes, and the passage of the,The blood of most species behaves differentially towards precipitants, and it is therefore conceivable that when blood is used as food and is elaborated into special compounds for the nutrition of the reproductive organs of a,All the members of this order are parasitic on aquatic vertebrates and in rare cases derive their food from a vertebrate host indirectly by means of another invertebrate,It shows how a bold and p lausible adventurer, aided by the profligacy of a,Schaudinn has stated, however, that Trypanomorpha becomes, in certain phases, attached to a red blood-corpuscle (ectoglobular), and, in others, penetrates inside one and eventually destroys it (endoglobular); while his other avian,sanguinis, Gruby, November 1843, Undulina ranarum, Lank., 1871), the best-known,a, Typical pear-shaped or oval forms; b, various stages in longitudinal division; c, nuclear division preparatory to multiple fission; d, endoglobular forms, in red blood-corpuscles (p = pigment grains); e, bacillary form of the,SCABIES, or Itch, a skin disease due to an animal,Parasitism: " On some Relations between Host and,The unexpected occurrence of these worms in pools and puddles, often in great numbers, has given rise to myths about showers of worms.

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