420 DISCOVERY REPORTS 



is made to multiple foetuses in other species. It has been suggested that, when 

 differences exist between the lengths of the foetuses, two or more successive ovulations 

 are indicated, and the differences in length have been used as a measure of the interval 

 between ovulations (Hinton, 1925, p. 124). Such a theory is very speculative, because 

 the occurrence of multiple foetuses is abnormal and differences, especially in size, may 

 be expected. In consequence this question is likely to remain unanswered until records 

 are obtainable of the condition of the ovaries in addition to the sizes of the foetuses. 



