that traumatic heat or cold shocks "during a critical period of its development can cause profound changes". The first experiments occurred in the 1890s. The mourning cloaks were temperature shocked at specific times in their development, which led to differences in pupae color. It was later learned that the color change was due to hormonal changes in response to varying temperatures. Conservation Mourning cloak butterflies are protected by law in Switzerland and Austria, though they generally have an increasing trend regarding population density in Finland. They also assume "safe" status in the Czech Republic. In general, the mourning cloak butterflies find areas that have experienced fire breaks to be more inviting, presumably because the fire breaks increase the amount of open space and clearings available to the butterflies, which is a more ideal habitat for these butterflies to live in. Subspecies Subspecies include: N. a. antiopa (Linnaeus, 1758) The nominotypical subspecies. Type-locality: "Sweden" N. a. hyperborea (Seitz, 1913) (Canada, Alaska) This subspecies lays more amber-yellow eggs, instead of the olive-green. As the eggs develop, the coloration will change to lilac pinkish-purple. These larvae's spines are shorter and stouter than those of European mourning cloak larvae. and the spots bordering the wing edges may be more of a violet color. N. a. lintnerii (Fitch, 1857) (slightly larger than preceding; se Canada, eastern US) N. a. asopos (Fruhstorfer, 1909) (Japan) Popular culture The Camberwell Beauty figures in the short story "A Plague of Butterflies" by Fred M. White, published in The Chronicle, Adelaide, Australia, 28 December 1918. Camberwell Beauty is a buddleia cultivar raised by Elizabeth Keep at the East Malling Research Station. There is a large mosaic of a Camberwell Beauty on the wall of the Passmore Edwards library, baths and wash house in Burgess Park, a large park that is close to the south London suburb of Camberwell. The Camberwell Beauty was the emblem of the Samuel Jones paper company and was previously on their factory on nearby Southampton Way, but was moved when the factory was demolished in 1982. A photograph of the mosaic was used on the cover of Camberwell indie band The House of Love on their self-titled 1990 album. Camberwell Beauty is a novel by Louis Golding, published in 1935. "The Adventure of the Camberwell Beauty" is a short story by August Derleth, published in 1952 in Three Problems for Solar Pons. The Solar Pons stories