and the elements in the Fe peak need temperatures well above 2X1G 9 °K for their formation. It is reasonable to suppose that the elements Na to Ca are produced at intermediate temperatures. We have shown that the carbon burning reactions at temperatures between 5X10 8 and 10X10 8 °K produce large amounts of Na 23 and of the Mg isotopes plus decreasing amounts of Al 27 and Si, but very little of heavier nuclei. One striking feature of our results is the relatively large ratio of Na 23 to Mg 24 produced, 1:2 to 1:5 depending on temperature, compared with the Suess-Urey 37 "cosmic abundance" ratio of 1:15. Our ratio of Mg 24 : Si 28 of about 50:1 is also in contrast with the cosmic abundance ratio of 1:1.

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