Just, however, became frustrated because he could not obtain an appointment at a major American university. He wanted a position that would provide a steady income and allow him to spend more time with his research. Just's scientific career involved a constant struggle for an opportunity for research, "the breath of his life". He was condemned by race to remain attached to Howard, an institution that could not give full opportunity to ambitions such as the ones Just had. In 1929, Just traveled to Naples, Italy, where he conducted experiments at the prestigious zoological station "Anton Dohrn". Then, in 1930, he became the first American to be invited to the Kaiser Wilhelm Institute in Berlin-Dahlem, Germany, where several Nobel Prize winners carried out research. Altogether from his first trip in 1929 to his last in 1938, Just made ten or more visits to Europe to pursue research. It was during this time, that Just co-authored on a research paper with a few other scientists, called, "General Cytology," which Scientists treated him like a celebrity and encouraged him to extend his theory on the ectoplasm to other species. Just enjoyed working in Europe because he did not face as much discrimination there in comparison to the U.S. and when he did encounter racism, it invariably came from Americans.