 At the same time, Johannsen (1911) introduced many ambiguities and questions about the import of his new terms. At first sight, the sense of classes is predominant. The phenotype, consisting of organisms “distinguishable by direct inspection or… by finer methods of measuring or description” (1911: 134), is used to identify the genotype as a class of organisms that shares constituents stable from generation to generation. Yet, no method is discussed to divide a natural varying population into phenotypes, let alone identify a genotype-as-class in such populations. It is in the restricted realm of inbred lines that identifying genotypes from phenotypes is possible, albeit not reliably if a phenotype includes a mix of inbred lines. Notice, however, if an inbred line is bred true (i.e., not crossed with any other lines), it is a genotype-as-class. There is no need to divide up the lines into phenotypes in order to identify genotypes, and it matters not that the traits of individuals in an inbred line vary with the conditions in which the individuals are raised. Indeed, the norm of reaction of the inbred line is one way to think of the genotype as an abstracted type.