From then to 1935 he published a number of papers on diffusion and adsorption in naturally occurring base-exchanging zeolites, and these studies continued during a year's visit to H.S. Taylor's laboratory in Princeton with support of a Rockefeller Foundation fellowship.
Fra 1930 til 1935 udgav han en række videnskabelige artikler om diffusion og adsorption i naturligt forekommende base-byttede zeolitter, og disse studier fortsatte under et år i H.S. Taylors laboratorie i Princeton med støtte fra Rockefeller Foundation.