Experiments and Observations Upon Glossina Palpalis

In Northern Nigeria the dry season begins in October, and ends in March. During this period practically no rain falls, and the highest temperatures of the year are recorded during the day, whilst the lowest annual temperatures occur during the night at this season. A short tornado season occurs at the beginning and end of the dry weather. In the case of Zungeru, where my experiments were carried out, the following is the meteorological return for the year 1910:—