number of papers were published on this work in the Journal of the Indian Chemical Society. In 1936, at the age of 75, he retired from active service and became professor emeritus. Long before that, on the completion of his 60th year in 1921, he made a free gift of his entire salary to the Calcutta University from that date onward, to be spent for the furtherance of chemical research, and the development of the Department of Chemistry in the University College of Science. He had written 107 papers in all branches of Chemistry by 1920. "Revolutionary in the garb of a Scientist" P C Ray was a staunch nationalist who had observed the deterioration that Indian society had undergone due to suppression by the British. He was sympathetic towards the revolutionaries and would make arrangements for their shelter and food at his factories. After his death, many revolutionaries and his colleagues mentioned about his indirect support and help in manufacturing explosives. The Government records of that time mention him as a “Revolutionary in the garb of a Scientist. Literary works and interests He contributed articles in Bengali to many monthly magazines, particularly on scientific topics. He published the first volume of his autobiography Life and Experience of a Bengali Chemist in 1932, and dedicated it to the youth of India. The second volume of this work was issued in 1935. In 1902, he published the first volume of A History of Hindu Chemistry from the Earliest Times to the Middle of Sixteenth Century. The second volume was published in 1909. The work was result of many years' search through ancient Sanskrit manuscripts and through works of orientalists. He donated money regularly towards welfare of Sadharan Brahmo Samaj, Brahmo Girls' School and Indian Chemical Society. In 1922, he donated money to establish Nagarjuna Prize to be awarded for the best work in chemistry. In 1937, another award, named after Ashutosh Mukherjee, to be awarded for the best work in zoology or botany, was established from his donation. Recognition and honours Honours and orders Companion of the Order of the Indian Empire (CIE; 1912 Birthday Honours list) Knight Bachelor (1919 New Year Honours list) Academic honours and fellowships Faraday Gold Medal of the University of Edinburgh (1887) Fellow of the Royal Asiatic Society of Bengal (FRASB) Fellow of the Chemical Society (FCS; 1902) Honorary Member of the Deutsche Akademie, Munich (1919)