242 [tnuch, 
in proportion ; it ia white in colour, of a circular form, flattened and 
depressed in the centre both above and below, ribbed and beaded 
boldly at the sides, and from thence more finely by degrees to the centre. 
The egg does not change colour, but retains its pure dead-white 
appearance even after the exit of the larva ; a small hole showing like 
a black spot on the side of the shell alone betraying the escape of the 
little creature. 
Mr. Hudson informed me of one of hia lixrvse being hatched on the 
29th February, which was followed by others on the 3rd March ; and 
all were placed on various little plants from the locality where tho 
parent butterfly had been taken, but from want of the right food, and 
partly by accidents, they were starved and lost. 
On the 28th February Mr, Hellins reported that one larva had 
hatched, and that it soon after died ; and another on 6th March, which 
was placed on heather, Lotus corniculatus, and one or two other vetches, 
but with no success. On the 18th March two of my eggs hatched, and 
the larvfe were placed with a variety of food, but they died without 
eating, and others soon followed in the same way, with Mr. Hellins 
and myself. However, shortly after, Mr. Hellins acquainted me with 
the fact of his having seen one distinctly eat a tiny hole in the leaflet 
of a -small vetch, Ervum tetraspermum, growing in his garden, and he 
sent me one of the plants, and upon this, for some days, the young 
larvae as they were hatched were placed ; but instead of eating they 
wandered away or fell ofl" into the earth below, where it was impossible 
to find them. 
Meanwhile we were not idle in ventilating the subject amongst 
our friends, in what seemed a forlorn hope of obtaining a clue to the 
proper food-plant, when fortunately at this critical juncture, Mr. 
Doubleday kindly gave us the benefit of his excellent memory and 
observation, in recalling the fact of his having seen, twenty years ago, 
in some place, this little butterfly flitting over Oemsta anglica and 
Ornitliopus perpusillus, and that on the latter he had noticed some 
females alight. 
In the midst of my trouble at losing the young larvsD daily, and 
being unable to find the desired Ornitliopus, I fortunately happened to 
mention the subject to Dr. F. B. "White, of Perth, and he with great 
good nature and promptitude despatched me a tin full of the plants. 
These were at once potted and sprinkled with water, the remaining six 
or seven eggs put on them in a sunny window, and in a day or two, by 
aid of a lens, the young larvae were soon detected. By the 3rd May 
some small transparent blotches were visible on the leaflets, on which 
