Dor-Loin's Pangcncsis. 
637 
worker bees and similar cases. If we let it drop, the 
first thesis stands out in a much purer light. 
Fig .146. Qucrcus sessiliflora albovariegata. A commercial 
variety. Green patches are scattered irregularly over a 
yellowish-white back-ground. 
In this direction, GALTON and BROOKS have done 
great service to the theory of pangenesis. Both strongly 
