Hess on the contribution by Pacini

Chapter 1 is devoted to the history of the discovery of cosmic radiation. Between 1905 and 1911 several attempts were made to explain the ionisation observed in closed vessels. K. Kurz (and others) claimed that radioactive substances in the soil and in the air could account for the observations. Hess and Eugster writes about the contribution of Pacini (page 4): "The first who expressed some doubts as to the correctness of this view was D. Pacini, who, in 1910, from measurements over sea and on shores at Livorno concluded that part of the observed ionization might be due to sources other than the known radioactive substances." Pacini, who died in 1934, was never nominated for the Nobel Prize. Hess was first nominated in 1933 and received the prize in 1936.

Hess conducted experiments on the effects of cosmic radiation on living tissue together with J. Eugster. The book Weltraumstrahlung und ihre biologische Wirkung was published in 1940. The translated edition shown above was published by Fordham University Press in 1949 and incorporated research carried out in the interim.