Issac Holden was a Bridgeport, CT resident from 1878 to 1903. He was an officer of the Walker and Wheeler Company during those years. Holden also was a famous algologist and worked closely with Francis Drouet a world famous algologist who started the National Herbarium which is part of the Smithsonian. Holden studied the algae of the Pequonnock River between the 1880's and 1903. He took algae samples and sent them to Francis Drouet. Many of these algae are summarized in my slide show which follows:
Some of the algae can be referenced in the virtual herbarium library at the University of Connecticut.
Also, the National Herbarium in Washington D. C. has an archive search to view information about various types of algae: http://collections.mnh.si.edu/search/botany/?ti=3
Issac Holden's obituary is posted: http://ucjeps.berkeley.edu/ina/pba/pba_holden.html
Unfortunately, Holden died in 1903 and apparently was not able to complete any additional work along the Pequonnock River. Holden was the President of the Bridgeport Scientific Society for 8 years.