Vitules and Muons :)

‎"Meyer even considers it hard to imagine that the smallest bacteria can be made of molecules. In his opinion, they are too small for that. According to this author, their building blocks are 'vitules','something smaller than molecules and consisting not of electrons but of muons, which are 2000 times smaller than electrons'"

Symbiogenesis: A new principle of Evolution by Boris Mikhaylovich Kozo-Polyansky (1924)