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THOMPSON YATES LABORATORIES REPORT 
Fig. 23 SpQre. 
Figs. 24-26 Growth of amoebula. 
Fig. 27 Sporocyte. 
Fig. 28 Freed spores. 
Fig. 29 Gametocyte. 
Figs. 30-41 Development of haemomenas praecox, the parasite of remittent, pernicious, or 
aestivo-autumnal fever of man. Several varieties, which are possibly distinct species. The amoebulae 
are small, contain only a few clumps of black melanin, and retire to the spleen, bone-marrow, etc., on 
approaching maturity ; the gametocytes have a special crescentic shape. 
Figs. 30-34 Growth of amoebula becoming a sporocyte. 
Fig. 35 Freed spores. 
Figs. 36-39 Growth of amoebula becoming a gametocyte. 
Fig. 40 Male gametocyte (portion of red corpuscle still present). 
Fig. 41 Female gametocyte (remains of corpuscle entirely disappeared). 
Figs. 42-52 Development of gametocytes of haemomenas praecox in stomach cavity of 
Anopheles. 
Fig. 42 Male gametocyte. 
Fig. 43 Female gametocyte 
Figs. 44-45 Gametocytes become oval five minutes after ingestion by the gnat. 
Figs. 46-47 Gametocytes become spherical a few minutes later. Polar bodies appear at 
the margin. 
Male gametocyte emitting microgametes (the so-called 'flagellate body'). 
Female gametocyte or macrogamete awaiting fertilisation. 
Free microgametes. 
Microgamete entering macrogamete. 
Fertilised macrogamete, or zygote. 
Development of Haemomenas praecox in tissues of anopheles. 
Zygote approaching inner surface of stomach wall. 
Zygote piercing stomach wall. 
F'g s - 5 5> 5^ Zygotes affixed to outer coat of stomach. They possess an apparently alveo- 
lar structure, and still contain granules of melanin. 
Fig. 57 Zygote increases in size. 
Figs. 58, 59 Zygotes increasing in size and dividing into meres, which become blastophores 
bearing blasts. 
Fig. 60 A single blastophore bearing a number of blasts affixed to it, each by one extremity. 
Fig. 61 Stomach seen by a low power, and dotted with a number of mature zygotes. 
Fig. 62 A fully mature zygote packed with blasts, some of which are escaping from a 
rupture in the capsule. 
Fig. 63 Free blasts in body cavity of anopheles. 
Fig. 64 Blasts entering capsule of salivary gland ; also lying within salivary cells and duct. 
Fig. 65 Junction of ducts of three lobes of salivary gland of one side, with blasts. 
Fig. 66 Blasts escaping from extremity of middle stylet or tongue of anopheles. 
Fig. 67 Capsule of a mature zygote containing five large black bodies, provisionally known 
as ' black spores.' 
Note — We may point out that the development of the remaining human species in anopheles and of H. relicta in 
alex are almost identical with those of H. praecox given in the plates. 
All the figures, except Fig. 61, are magnified 2500 diameters. Fig. 61 is magnified about 70 diameters, the stomach 
ssues being flattened and extended by the cover-glass. 
Fig 
48 
Fig 
49 
Fig. 
50. 
Fig 
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Fig 
5 2 
Figs. 53- 
67 
Fig 
53 
Fig. 
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