  The preceding paragraph contains singular terms that (apparently) refer to types. An even more telling commitment to types are the frequent quantifications over them. Mayr (1970, p. 233), for example, tells us that “there are about 28,500 subspecies of birds in a total of 8,600 species, an average of 3.3 subspecies per species…79 species of swallows have an average of 2.6 subspecies, while 70 species of cuckoo shrikes average 4.6 subspecies”. Although these examples come from biology, physics (or any other science) would provide many examples too. It was claimed (in the sixties), for example, that “there are thirty particles, yet all but the electron, neutrino, photon, graviton, and proton are unstable.” Artifactual types (the Volvo 850 GLT, the Dell Latitude D610 laptop) easily lend themselves to reference also. In chess we are told that accepting the Queen's Gambit with 2…dc has been known since 1512, but Black must be careful in this opening—the pawn snatch is too risky. Type-talk is ubiquitous.