Elementary biology; an introduction to Elementary biology; an introduction to the science of life elementarybiolog00grue Year: 1924 INSECTS AS INTERMEDIATE HOSTS 405 without wearing veils and gloves. Thus they lived through the most dangerous part of the year, from early in July until late in October, and not one became sick, although many of their neighbors became Fig. 209. The malaria parasite The parasite attacks the red blood corpuscle of a human being, a, and when it has destroyed the corpuscle, d, it breaks up into a large number of spores^ e, which may enter other corpuscles and sta
Elementary biology; an introduction to Elementary biology; an introduction to the science of life elementarybiolog00grue Year: 1924 INSECTS AS INTERMEDIATE HOSTS 405 without wearing veils and gloves. Thus they lived through the most dangerous part of the year, from early in July until late in October, and not one became sick, although many of their neighbors became Fig. 209. The malaria parasite The parasite attacks the red blood corpuscle of a human being, a, and when it has destroyed the corpuscle, d, it breaks up into a large number of spores^ e, which may enter other corpuscles and start a new cycle. When blood containing the malaria organism,/, gets into the stomach of a mosquito {Anopheles), the protoplasm undergoes various changes, g. k, resulting in two sexual forms, i,J, which conjugate and produce a fertilized egg, k. This works its way into the wall of the insect's stomach, /, and breaks up into a large number of tiny bodies, m, which finally lodge in the insect's salivary glands, « When the insect again stings a person, some of these bodies, 0, get into the victim's blood and find their way into the red corpuscles, <?, and the cycle begins again. /, stomach of infected mosquito, showing swellings produced by the parasite infected with malaria during the summer. At the same time some mosquitoes were caught and allowed to suck blood from persons suf- fering from the disease. These mosquitoes were placed in little cages and shipped to England. Here two young men — one of them the
Size: 1512px × 1323px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
