The egg (Plate 15), when freshly laid, is whitish, faintly tinged with greenish; it soon changes to yellow, and, later on, turns orange and then dark violet. When the latter colour appears, the little caterpillar may be expected to hatch out very shortly. The eggs are placed upright on the foot-stalks of the flowers, and may be readily found in June by searching the blossom-clusters of hedge-mustard or cuckoo-flower. The caterpillar, when mature, is dull bluish-green, with raised dots and warts; from the former arise whitish hairs, and from the latter longer blackish hairs. There is a white line, or stripe, along the sides, and the underparts of the body are greener than the back. Both in colour and marking the caterpillar agrees so closely with the seed-pods of its food-plant that its detection is not always easy. A peculiarity in very young caterpillars of this species, and also those of some of the "Whites," is, that the hairs are forked at the tips, and bear globules of moisture thereon (see figure and remarks on p. 3). [Illustration: _Pl._ 14. =Green-veined White (Irish).= 1 _male_; 2, 3 _female_. =Bath White.= 4, 5 _male_; 6 _female_.] [Illustration: _Pl._ 15. =Orange-tip Butterfly.= _Egg, natural size and enlarged; caterpillar and chrysalis._] The caterpillars feed in June and July on lady's smock or cuckoo-flower (_Cardamine pratensis_), charlock (_Brassica sinapistrum_), hedge-mustard (_Sisymbrium officinale_), garlic mustard (_S. alliaria_), rock-cress (_Arabis_), horseradish (_Cochlearia armoracia_), dame's violet (_Hesperis matronalis_), watercress (_Nasturtium officinale_), etc. The chrysalis, as will be seen from the figure (Plate 15), is curiously elongated, and tapers towards each end; the outline of the back is curved, and the wing-cases bulge out into an angle about the middle of the under side. The colour is pale grey or whitey-brown, sometimes with a strong rosy tinge; the back is speckled with brownish, and has an olive-grey dorsal line, and the veins of the wings are well defined. This stage lasts, as a rule, from August of one year until May of the following year. When the chrysalis is first formed, it is green, with the wing-cases brighter, and this colour is sometimes retained. It has been stated that the chrysalids assume the colour of their immediate surroundings, and this may be so; but all that I have had under observation were of the colours described above, although some were fastened to green stem, others to muslin, and others, again, to glass.