During the 1920s the German zoologist Alfred Kastner emerged as the leading student of opilionology and arachnology in general.

Ye may hear him, on a lown day, at every farm-house in the parish.

Tree of many names, and under any of them, of ill repute, was the hebenon, hebona, hebenus, hebon or heben. At best, poets wrote of its narcotic effects. As early as 1386, John Gower wrote in Confessio Amantis, of 'Hebenus, that slepy tre'.

We created model sets including all possible additive combinations of independent predictors of hemoparasites and extrinsic variables (32 models in total); furthermore, interaction terms were included in additional models whenever investigation of predictor vs. response variable plots revealed possible interactions between these variables.