February 16, 1932



Dr. I. Ochoterna,

Universidad Nacional de Mexico Autonoma, 

Mexico D.F., Mexico



My dear Doctor Ochoterena:



I have just received the copy which you have so graciously sent me of your "Tratado Elemental de Biologia," at which I have only had time to glance, but which I am going to give myself the pleasure of attentively examining.  



I deeply appreciate your kind remembrance of me.  With the best wishes for your individual prosperity, the good health and happiness of your collegues, and the prosperity of your great University, I am as ever,