Hybridity and the Evolution of Species

I AM sorry to say that the postscript of ``The Writer of the Article'' to my letter on p. 274 in NATURE of October 27 is not according to facts. It was he who used Trillium, Dirca, and Scoliopus as evidence against ``bad pollen'' being an indication of hybridity; this evidence appeared to me to be insufficient, and I stated the reason why. In his postscript ``The Writer of the-Article'' makes no attempt to refute my arguments against his view, but says: ``In such cases as Trillium, Dirca, and Scoliopus it is not sufficient for hkn [meaning me] to suggest that they must.be hybrids merely because they have bad pollen,'' though I have never suggested this, or referred to Trillium, Dirca, and Scoliopus in any of my previous writings.