. Annals of tropical medicine and parasitology. Parasites. 400 witli the water, bi'.t larvae were quite capable of developing in tap water when less crov>'ded. Fourteen out of fifteen became adults under similar conditions in tap water where the concentration was 50 per larva. Concentration of Larvae The effects of overcrowding are shown in the following experi- ments, and indicate that where experiments are carried out to test the values of different foods or waters, the results are not comparable if the concentration of larvae has not been the same in each experiment. Table XIV. Resu
. Annals of tropical medicine and parasitology. Parasites. 400 witli the water, bi'.t larvae were quite capable of developing in tap water when less crov>'ded. Fourteen out of fifteen became adults under similar conditions in tap water where the concentration was 50 per larva. Concentration of Larvae The effects of overcrowding are shown in the following experi- ments, and indicate that where experiments are carried out to test the values of different foods or waters, the results are not comparable if the concentration of larvae has not been the same in each experiment. Table XIV. Resujt of Varying the .Amount of Tap Water per Larva. .Amount of water per larva 50 250 No. of larvae in each jar 15 '5 No. of pupae produced 15 15 No. of adults produced '+(9^3; 5??) 15 ('o^^; 59?) -Average duration of larval and pupal stages, ijo ... I4'2 days IO-8 days Average duration of larval and pupal stages, $$ ... 17-8 days lyc days This experiment is complicated by the fact that in the jar with 50 of water per larva there was only one-fifth of the quantity of rice present in the other jar (o"Oo6 per cent.). As it became used up, therefore, rice was added gradually to the former jar till equal quantities had been placed in both without raising the percentage present at any time much above 0'Oo6. Table XV. Variation of the Amount of Rain Water per Larva. Amount of water per larva. No. of larvae ... No. of pupae produced ... No. of adults produced Average duration of larval and pupal stages, ^^ Average duration of larva and pupal stages, ^^. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Liverpool School of Tropical Medicine. Liverpool University Press [etc. ]
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectparasites, bookyear19
