474 Mr. J. H. Orton. Occurrence of Pr diandric [June 8, 



Stage III chain in one of the conditions represented in Table IV. Similarly, 

 Stages IV and V, and so on, would be formed, and tables could be drawn 

 up to indicate their different possible conditions. 



Table II * 



Table III * 





A. B. 



No of times 

 found among 

 records made. 







A. B. C. 



No. of times 

 found among 

 records made. 



Stage I (a) ... 





51 





Stage II (a) ... 



3 3 : 



4 



„ lb) ... 



3 u.r. : 









„ (b) ... 



3 u.r. <? : 



1 



„ (o) ... 



w ... 



$ •■ 



4 





» (0 ... 



i S : 



3 



9 p.r. : 



11 





„ id) ... 



? p.r. 3 : 



12 



„ w ... 



9 



40 





„ (e) ... 



? 3 ■■ 



30 











(/) 



$ u.r. : 













„ iff) - 



? i ■■ 



10 









„ (A) ... 



? $ p.r. : 



5 









„ ii) - 



? ? : 



4 



Table IV* 





A. 



B. 



c. 



D. 



No. of times found 

 among records made. 



Stage III (a) 



<? 



<? 



3 









» (*) 



^ u.r. 



<? 



3 









(c) 



§ 



iJ 



3 









» (d) 



? i?.r. 



<? 



3 





5 



„ ie) 



? 



* 



3 





11 



„ (/) 



? 





3 





1 



„ iff) 



? 





3 





8 



» (*) 



? 





3 





16 



„ (0 



? . 



9 



3 





5 



„ U) 



? 



9 



3 u.r.: 







» (*) 



9 



9 



$ 





3 



il) 



9 



9 



9 p.r. : 



1 



» (m) 



9 



9 



9 





1 



* 1. In these tables the chains read horizontally and the life-histories of the individuals may 

 be read vertically. 



2. Some of these chains occur as side-chains. 



On examining the whole of the records made of the natural chains, I find 

 that all the conditions of chains shown in Tables II, III, and IV occur except 

 Stage I (&), Stage II (/), and Stage III (a), (b), (c), and (J). The number 

 of times each condition in these stages is found in the whole of the records 

 is put in the right-hand column in Tables II, III, and IV. Probably the 

 earlier conditions of Stage III chains do not occur because the <$ period of life 

 will already have been passed by " A " individuals before more than one or 

 two males have been able to settle down on them. Since nearly all conditions 



