Benda (1897) gave the term 'Mitochondria' after Richard Altmann (1894) who described them as 'bioplasts'. Mitochondria were first observed by Kolliker (1880) in the muscle cells of insects and the presence of mitochondria in plant cells was first detected by F. Moves in 1904 in Nymphaea. Palade (1955) described ribosomes in animal cells under the electron mkroscope as a dense particle or granules and Robert (1958) coined the term 'ribosome'. However, they were first discovered by 'Claude' (1941) as 'microsomes'. de Duve coined and first observed the single unit membraned Spherical bodies, lysosomes in animal cells. de Duve also coined the term 'Peroxisome' for the granular, single unit membrane structures in germinating seeds, though peroxisomes were first described from liver and kidney cells by Rodhin (1954).