J. S. O., Cincinnati, Ohio, asks: "Will you please give us the rule for the terminal i in botanical names? For instance.should we write Smithi, or Smithii?" [It should in Smith's case be Smithii. It is no use to give you the rule unless you are acquainted with the Latin language. We can only say that in Latin the form of the genitive depends on its nominative. When the nominative ends in us, the us changes to i to form the genitive. Smithius, the Latin of Smith in the nominative case thus makes Smithii in the genitive. There are two i's only because one is already there.[ - Ed. G. M.]