The ecology and life history The ecology and life history of the common frog (Rana temporaria temporaria) ecologylifehisto00sava Year: 1962 DAYS Fig. 3. The Changes in the Nitrogen Content of Two Sets of Frog Embryos, left on the Spawn after Hatcliing and Removed from it Note that there is no appreciable diflference. In fact, one set gained more when on the jelly, and the other gained less. Note also the large difference in the two sets of embryos. Black circles on spawn. Open circles, not on spawn. Black and open circle, near spawn. 18

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