Permutations of Sex 



space will leave her the liberty of movement 

 necessary for her operations. The other rear 

 tubes, the minority, whose diameter is about 

 6 millimetres,^ contain sometimes only females 

 and sometimes females at the back and males 

 towards the opening. One can see that a 

 tube a trifle wider and a mother slightly 

 smaller would account for this difference in 

 the results. Nevertheless, as the necessary 

 space for a female is barely provided in this 

 case, we see that the mother avoids as far as 

 she can a two-sex arrangement beginning with 

 males and that she adopts it only in the last 

 extremity. Finally, whatever the contents of 

 the small tube may be, those of the large one, 

 following upon it, never vary and consist of 

 females at the back and males in front. 



Though incomplete, because of circum- 

 stances very difficult to control, the result of 

 the experiment is none the less very striking. 

 Twenty-five apparatus contain only males in 

 their narrow gallery, in numbers varying from 

 a minimum of one to a maximum of five. 

 After these comes the colony of the large gal- 

 ler)', beginning with females and ending with 

 males. And the layings in these apparatus 



'.234 inch. — Translator's Note. 



165 



