RANGELEY — The Wilhelm Reich Museum free summer Sunday Natural Science Program scheduled for 2 p.m. Aug. 23 will be “Apple Varieties” by Warren Balgooyen.

Balgooyen is a Colby College graduate with a degree in biology. He was employed at the Brooklyn Botanical Gardens, Brooklyn, N.Y., from 1963 to 1983. In 1983 Balgooyen became a freelance naturalist and landscaper in Maine. He is a board member of several conservation and wildlife groups.

Balgooyen runs a small nursery at his home in Norridgewock. He also writes a nature column for the Town Line, a weekly published in South China, and he contributes to the Birdwatchers Digest.

Visitors are invited to visit the observatory building, which details the life and work of physician/scientist Wilhelm Reich, whose interest in the natural environment led to the introduction of the natural science program in 1989. The observatory is open from 1 to 5 p.m. Wednesday through Sunday in July and August, and 1 to 5 p.m. Sundays in September. The adult admission is $6; children 12 and under, free.