We have obtained evidence that trees store the record of climate in their rings. In each ring the ratios of the stable isotopes of hydrogen and oxygen vary in proportion to the air temperature when the ring was formed because the isotopic composition of rain and atmospheric CO2 varies with temperature. In this paper the stable isotope variations of hydrogen and oxygen in a Japanese cedar have been correlated with the secular variations of radiocarbon measured in bristlecone pines by Suess (1970). We find significant negative correlations for both isotope ratios over the last 1800 years. The inference is that the small-scale (~1%) variations in 14C concentrations in tree rings are related to climate variations. In our data we find periodicities of 58, 68, 90, 96, 174, 204, and 272 years. Because our samples are averaged over 5 years each, we are not able to detect the 21-year sunspot cycle in the present data. The Suess samples averaged over about 25 years each reveal a periodicity of 183 years, in agreement with our periodicity of 174 years.