Penicillin nontoxic in humans by first performing toxicity tests in animals and then on humans. His subsequent experiments on penicillin's response to heat and pH allowed Fleming to increase the stability of the compound. The one test that modern scientists would find missing from his work was the test of penicillin on an infected animal, the results of which would likely have sparked great interest in penicillin and sped its development by almost a decade. The importance of his work has been recognized by the placement of an International Historic Chemical Landmark at the Alexander Fleming Laboratory Museum in London on
Valentine S. Keppel the grade school and high school board. He also served on the La Crosse County Board and was chairman of the county board. During World War I, Keppel served on the local draft board. From 1907 to 1909, Keppel served in the Wisconsin State Assembly. Then, from 1925 to 1933, Keppel served in the Wisconsin State Senate and was a Republican. Keppel died in Holmen, Wisconsin as a result of a stroke. Valentine S. Keppel Valentine S. "V.S." "Val" Keppel (February 21, 1865 – September 7, 1940) was an American farmer and politician. Born in La Crosse County, Wisconsin in