Dr. Bryant, who since 1920 had served as a summer employee on the Yosemite educational staff and who had been a member of the Committee on Study of Educational Problems in National Parks, was made head of the new branch on July 1, 1930. Antedating the establishment of the branch by one year was the previously mentioned wildlife survey instituted in national parks by George M. Wright, who began his career in the National Park Service as a park ranger in Yosemite in 1927. Thus it is evident that the pioneer interpretive work done in Yosemite projected its influence and its personnel into the wider fields of “nature guiding” and museum programs throughout the National Park Service. It may be shown, also, that the educational work done by the Yosemite staff has been instrumental in advancing the naturalist programs in state parks and elsewhere where out-of-door nature teaching is offered to the public.[17] Some three hundred public areas and agencies in the United States provide naturalist services modeled on the Yosemite plan. Only ten per cent of these are in the National Park System. One of the far-reaching influences of the Yosemite naturalist department is the Yosemite School of Field Natural History, a summer school for the training of naturalists, where emphasis is placed on the study of living things in their natural environment. The school was founded in 1925 by Dr. H. C. Bryant in answer to a demand for better trained naturalists for the Yosemite staff. There was need for a training not furnished by the universities. The California Fish and Game Commission coöperated with the National Park Service in starting this school program. The staff is composed of park naturalists and the regular Yosemite ranger-naturalist force, aided by specialists from universities and other government bureaus. The last week of the field period is spent in making studies at timberline. As the name implies, emphasis is placed on field work. The work is of university grade, although no university credit is offered. Graduates of this school are filling positions as nature guides in parks and summer camps throughout the country. Many of the naturalist and ranger-naturalist positions in the National Park Service are held by graduates of this field school.