Data gathered between 1959 and 1960 during 49 insect trapping nights.
For each trapping night, the abundance of 17 Trichoptera
species is recorded as well as 6 meteorological variables which may influence
the abundance of each species. Finally, the observations (that is to say,
the trapping nights), have been classified into 12 groups corresponding to
contiguous nights between summer 1959 and summer 1960.