Years later, he commenced studying chemistry at Worcester County Free Institute of Industrial Science, graduating in 1881.  Following that, he became Professor of natural science at Williston Seminary, Easthampton, Mass. (1881-1887).

In 1887, Cobb moved to Jena, Germany, where he obtained his PhD in 1888 studying under Ernst Häckel. His thesis was on new nematode species, including a description of 

Initially unable to find employment in science in Australia, Cobb sold oil, watches and soap for an importer. He also designed newspaper advertisements for the products that included chemical analyses conducted in his home laboratory.

In 1890, Cobb was appointed plant pathologist in the New South Wales Department of Agriculture.  He worked on wheat varieties and wheat rusts, but also on myriad other problems in vegetable and sugarcane. He continued study of nematodes in his spare time.  By 1897, a customized laboratory was built at Wagga Experimental Farm for his wheat research.  Between 1898 and 1901 he was appointed Special Commissioner on Agriculture to visit and report on the state of agricultural technology in Europe and the U.S.  Upon his return to Australia, Cobb found that he had been replaced in the wheat research program.  Although he continued to work as a plant pathologist, he began to seek other opportunities.

In 1905, Cobb accepted a position as plant pathologist for the Hawaiian Sugar Planters Association at the Experiment Station in Honolulu.  After 2 years, in 1907, he moved to a position as Agricultural Technologist with the USDA Bureau of Plant Industry in Washington, DC.  There he worked on standardizing grading systems for cotton and on storage and processing methods.  In 1915, he was relieved of his duties, apparently for recommendations he made at a meeting that were not approved by his administrators.   Instead, Cobb was reassigned as Nematologist in the Bureau of Plant Industry.

His work as Nematologist with the Bureau of Plant Industry probably contributed most to Cobb's recognition as the "Father of U.S. Nematology".  He successfully convinced the USDA to establish a Dicision of Nematology and he argued for the distinction between Nematology and Helminthology. He was less successful in his arguments for the use of the word "nema" rather than "nematode". Cobb conducted research on plant-feeding nematodes associated with many crops and continued his studies on the marine nematodes. During this period, Cobb collaborated with scientific illustrator William Chambers who contributed to artistic renditions of nematodes.  Cobb himself was a gifted illustrator and artist.

N.A. Cobb reached retirement age of 65 in 1924 and was given a 5-year contract extension to continue his work.  During that time period he served as president of the American Society of Parasitologists. A further 3-year extension of his appointment was terminated by his death at age 72 in 1932.  Cobb died of a heart attack while in Johns Hopkins Hospital, Maryland, for an annual physical examination.

Throughout his career, N.A. Cobb sought improvements in technology and instrumentation.  He developed methods to desiccate and stain nematodes, and modifications of  photographic equipment.  His major focus was in the improvement, adjustment, and light sources for microscopes, including development of the camera lucida. Even now, important nematode specimens are mounted on "Cobb's slides" between two coverslips.  The slides allow observation of the specimen from both sides and minimize refractive interference of the image.

N.A. Cobb was an extremely productive scientist, a keen observer, and a prolific writer.  His bibliography includes some 568 publications (Spenneman, 2003).

For more on N.A. Cobb Father of Nematology

Buhrer, E.M. 1969. Nathan Augustus Cobb (1859-1932), a tribute. Journal of Nematology 1:2-3.

Hall, M.C. Nathan Augustus Cobb. Journal of Parasitology 19:1-4.

Spennemann, D.H.R. 2003. Nathan Augustus Cobb Plant Pathologist. A Bibliography of his work. Albury, N.S.W. : Retrospect.

1.	NATHAN AUGUSTUS COBB was born June 30, 1858 in Spencer, MA. Died June 4, 1939. He married ALICE VARA PROCTOR 8 AUG 1881, daughter of EDWARD PROCTOR and SARAH BULLEN. She was born 23 APR 1854 in Spencer, MA.
	Children of NATHAN AUGUSTUS COBB and ALICE VARA PROCTOR are:   2   i. RUSSELL HARDING COBB was born 10 JUL 1882 in Easthampton, MA, and died 26 MAR 1884.   3   ii. MARGARET VARA COBB was born 16 MAY 1884.   4   iii. VICTOR COBB.   5   iv. ROGER COBB.   6   v. FRIEDA COBB was born 20 OCT 1889 in Sydney, Australia.   7   vi. RUTH COBB was born in Sydney, Australia.   8   vii. DOROTHY COBB was born 28 OCT 1892 in Sydney, Australia.

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