Permutations of Sex 



foremost condition is patience. This condi- 

 tion I fulfilled; and it was rewarded with the 

 success which I was justified in expecting. 



The tubes employed are of two kinds. The 

 first, which are cylindrical and of the same 

 width throughout, will be of use for confirm- 

 ing the facts observed in the first year of my 

 experiments in indoor rearing. The others, 

 the majority, consist of two cylinders which 

 are of veiy different diameters, set end to 

 end. The front cylinder, the one which pro- 

 jects a little way outside the hive and forms 

 the entrance-hole, varies in width between 8 

 and 12 millimetres.^ The second, the back 

 one, contained entirely within my packing- 

 case, is closed at Its far end and is 5 to 6 

 millimetres" in diameter. Each of the two 

 parts of the doublc-galleried tunnel, one nar- 

 row and one wide, measures at most a 

 decimetre^ in length. I thought it advisable 

 to have these short tubes as the Osmia is 

 thus compelled to select different lodgings, 

 each of them being insufficient In Itself to 

 accommodate the total laying. In this way I 

 shall obtain a greater variety in the dlstribu- 



'Betvvccn .312 and .468 inch. — Translator's Note. 

 -.195 to .234 inch. — Translator's Note. 

 ^3.9 inches. — Translator's Note. 



z6i 



