The consequences of the conservtion of isobaric spin in K -meson capture on a pair of nucleons are investigated. Certain relations involving production cross-sections and capture and production ratios are derived; the effect of the assumption of the predominance of the final baryonic or meson-nuclion interaction is determined. Similar considerations are applied to the absorption processes in light nuclei like the deuteron and helium, etc. Lastly, an angular momentum analysis of the absorption processes is considered to detemine the relative parities of the K and Y particles.