Fishery Board for Scotland. 



60" *tO 



Scale divisions. 

 Fig. 3 —Eggs without oil-globule ; size-frequencies (February 1907). 



^0 \b 



SO 85 qo 



Scale divisions. 



C{b <00 f05 



Fig. 4. — Variation in 6218 Plaice eggs — Dornoch Firth (February). 



- Theoretical frequencies. 



Observed frequencies. 



