THE SPERM WHALE 



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dated records of the lengths of seventy-four foetal Sperm whales, collected from various 

 whaling stations. These are shown in Table X. The lengths of these foetuses together 

 with those of the foetuses examined by the Discovery staff, are plotted against 



Table X. Sperm whale. British Museum records of foetuses 



* Twins. 



months in Fig. 39. In this scatter diagram it will be seen that the points fall into three 

 groups: the majority near the centre of the diagram, two isolated points at the left-hand 

 top, and a third group at the right-hand bottom. If, now, the points of the central group, 

 and those points of the third group representing foetuses under i m. in length, are 

 averaged by months separately, and the averages are plotted on a 2-year time scale, with 



6-2 



