"for the invention and development of the cyclotron and for results obtained with it, especially with regard to artificial radioactive elements"
"for his work on sex hormones"
"for his work on polymethylenes and higher terpenes"
"for the discovery of the antibacterial effects of prontosil"
"for his deep understanding of his country's peasantry and the exquisite art with which he has portrayed their way of life and their relationship with Nature"