rOfJJXATlOX j»7 



W'liLMi tlic caterpillars arrive at iiiaturit\- the\- 

 escape by hitiiiL; a hole in the wall of the cajisule, 

 and creeping" out, the\- seek for a suitable |)lace in 

 which to turn to chr\sali(les. 



Scentless flowers usuall)' ha\c some equivalent 

 form of attraction, such as honew brilliant ccjlour 

 pollen in abundance, or the j^roupin^ of a number 

 of small florets, in order to secure a conspicuous 

 effect as in the ox-e\'e dais)-, or hedge parsley. 



Stront^ and \aried odours are great helps to 

 ensure pollination b\- insects. The bee-tribe and 

 moths and butterflies are specialh- attracted by the 

 sw eet scents of roses, \iolets, carnations, ajid sweet- 

 peas, and the j^owerful odour emitted bj- such 

 flowers as the eNenini; primrose, tobacco, and night- 

 llowering rocket as evening comes on tends to 

 guide the nocturnal moths to these and similar 

 flowers. An odour ma\-, of course, be pleasant to 

 an insect which to us would be simpl\- intolerable. 

 The arum of the hedges, and those curious plants, 

 the aristolochias and stapelias, all emit scents of 

 the most fietid description, as we think, but flies, on 

 the contrar}-, are attracted b\- thousands, and 

 hold api^arentl}' joN'ous re\els in the blossoms 



