Zoological Society from 1925 until his death. Historian Jonathan Spiro has argued that Grant's interests in conservationism and eugenics were not unrelated: both are hallmarks of the early 20th-century Progressive movement, and both assume the need for various types of stewardship over their charges. In Grant's mind, natural resources needed to be conserved for the Nordic Race, to the exclusion of other races. Grant viewed the Nordic race lovingly as he did any of his endangered species, and considered the modern industrial society as infringing just as much on its existence as it did on the redwoods. Like many eugenicists, Grant saw modern civilization as a violation of "survival of the fittest", whether it manifested itself in the over-logging of the forests, or the survival of the poor via welfare or charity. Nordicism Grant was the author of the once much-read book The Passing of the Great Race (1916), an elaborate work of racial hygiene attempting to explain the racial history of Europe. The most significant of Grant's concerns was with the changing "stock" of American immigration of the early 20th century (characterized by increased numbers of immigrants from Southern and Eastern Europe, as opposed to Western and Northern Europe), Passing of the Great Race was a "racial" interpretation of contemporary anthropology and history, stating race as the basic motor of civilization. Similar ideas were proposed by prehistorian Gustav Kossinna in Germany. Grant promoted the idea of the "Nordic race", a loosely defined biological-cultural grouping rooted in Scandinavia, as the key social group responsible for human development; thus the subtitle of the book was The racial basis of European history. As an avid eugenicist, Grant further advocated the separation, quarantine, and eventual collapse of "undesirable" traits and "worthless race types" from the human gene pool and the promotion, spread, and eventual restoration of desirable traits and "worthwhile race types" conducive to Nordic society: In the book, Grant recommends segregating "unfavorable" races in ghettos, by installing civil organizations through the public health system to establish quasi-dictatorships in their particular fields. He states the expansion of non-Nordic race types in the Nordic system of freedom would actually mean a slavery to desires, passions, and base behaviors. In turn, this corruption of society would lead to the subjection of the Nordic community to "inferior" races, who would in turn long to be dominated and instructed by "superior" ones utilizing authoritarian powers. The result