INTRODUCTION. IxV 



Pieris similarly occupied, which thus seemed to form the white 

 centre of the flower. I still remember the amazement of my 

 travelling companion when, on my nearer approach, the whole 

 flower dissolved into a swarm of Butterflies. 



" I afterwards saw another beautiful flower of the same kind, 

 in which the petals were composed of a number of the red 

 Pieris zarinda, Boisd., along with some yellow and white 

 Pieridce, in another part of South-west Celebes, in one of the 

 above-mentioned places where Butterflies, especially Papilio- 

 nidcE and Pieridce, love to resort, just above the beautiful 

 waterfall of Maros, which Wallace has described ; and I saw 

 there at the same time something which I never saw before or 

 afterwards, and had never heard or read of before, for there I 

 saw a Butterfly bathing. 



" While I stood on the bank of the river, which forms at 

 this spot an apparently still 'and very clear pool before enter- 

 ing the cleft in the rock from which it reappears as a foaming 

 and thundering waterfall, a specimen of Papilio hclenus, 

 Linn., came flying over the water. Flying low, as is the 

 habit of this species, it came within a short distance of me, 

 when I saw it suddenly half close its wings, and dive down 

 close beside me, so that the whole body and about a third of 

 the wings, which slanted upwards, were immersed ; it then 

 raised itself again out of the water, and flew away. We cannot 

 require stronger proof of the necessity of moisture to an insect 

 which seems so little fitted for contact with water. 



" Just as some plants in the East Indies choose the dryest 

 localities parched up by the burning sun, so do some Butter- 

 flies select similar spots, such, for instance, as Junonia orithya, 

 Linn., and without needing rest, enjoy settling on the scorch- 

 ing hot sand. And like other plants which choose very damp 

 and deeply-shaded localities in the forest, where no ray of sun- 

 light can penetrate, some Satyrina and other Butterflies, 

 4 E 



