Cika wannan jumla: Hess ya gudu zuwa Switzerland na dan lokaci bayan da aka dakatar da
Ƙungiyar 1848. Har ila yau, zai tafi kasashen waje a lokacin yakin Franco-Prussian na 1870-71. A cikin shekarun 1850 Hess ya nutsar da kansa cikin nazarin kimiyyar halitta da kuma samun, a cikin hanyar da ta dace, tushen kimiyya don tunaninsa.