Abstract
DURING their work on the effect of ultrasonic waves on the hatching of Aedes aegypti eggs Quraishi et al.1 found an interesting pattern of hatching in the controls. Aedes aegypti eggs laid overnight were kept in water in Petri dishes and the percentage of larvae hatching out each day was recorded for 20 days. On the first day 2.5 per cent of the eggs hatched out; on the second day this percentage was 13, the highest recorded for any single day. The percentage of eggs hatching out gradually decreased after the second day, until after the 13th day, when there was an upward trend in hatching, and a small peak was discernible between the 14th and 16th days. There was a sudden fall in the number of eggs hatching out after the 16th day and by the 20th day only 62.5 per cent of the eggs hatched out. Thus 37.5 per cent of apparently normal eggs were left unhatched. We therefore decided to follow the hatching pattern of Aedes aegypti eggs for 50 days.
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