Abstract
D/H ratios of C-H hydrogen in cellulose extracted from 19 successive increments of wood from three adjacent tree rings from a Pinus radiata grown in New Zealand in 1915–1918 follow qualitatively the isotopic pattern of the D/H ratio of the precipitation of the Kailaia area in New Zealand. This relationship between the D/H ratio of the cellulose and precipitation is the opposite to that claimed by Wilson and Grinsted [Nature 257 (1975) 287–288]. Consequently their biochemical thermometer based on the relationship between the D/H ratio in cellulose of the Pinus radiata and temperature has no basis. Their arguments based on the data of Epstein and Yapp [Earth Planet. Sci. Lett. 30 (1976) 252–261] to support their biochemical thermometer is also shown to be invalid.
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