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
William Valentine Doctorate in Pedagogy from the Central Philippine University in Iloilo City. The university honored him further on October 1, 2005, when Central Philippine University celebrated its Founder's Day with the unveiling of a bronze bust of Valentine at Old Valentine Hall. In Negros, the Bacolod Evangelical Church and the Bacolod Christian College as well as schools and missions throughout the province are outgrowths of Valentine’s work. William Valentine "For the Nova Scotian painter see William Valentine (painter)" William Orison Valentine (May 9, 1862– February 2, 1928) was an innovative educator and missionary in service of the American Baptist Foreign Mission