Charles Robertson (image) Washington University in St. Louis Share Print E-Mail Caption Charles Robertson, a professor of biology and Greek at Blackburn College in Carlinville, Ill., 50 miles northeast of St. Louis, meticulously recorded the interactions of insects and flowering plants within a 10-mile radius of Carlinville at the turn of the century. The data he collected provides a baseline from which changes in plant-pollinator networks can be measured. Credit History of Macoupin County Illinois, published in 1911 Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.