It must be pointed out, however, that among those specimens marked as “_Levana_” there were none which entirely corresponded with the natural _Levana_, or which indeed approximated so nearly to this form as did some of the specimens in Exp. 9. All were larger than the natural _Levana_, and possessed, notwithstanding the large amount of yellow, more black than any true _Levana_. In all artificially bred _Levana_ the black band of the basal half of the hind wings is always interrupted with yellow, which is seldom the case with true _Levana_. The whole appearance of the artificial _Levana_ is also coarser, and the contour of the wings somewhat different, the fore-wings being broader and less pointed. (See figs. 7 to 9, Pl. I.). 12. Larvæ of the fourth generation, found on September 22nd, 1872, were divided into two portions:-- A. Placed for pupation in an orchid-house at 12°-25° R., and allowed to remain there till December. In spite of the high temperature not a single butterfly emerged during this time, whilst pupæ of _Vanessa C-album_ and _Pyrameis Atalanta_, found at the same time, and placed in the same hothouse, emerged in the middle of October. From the middle of December the pupæ were kept in an unheated room, and they emerged very late in the spring of 1873, all as _Levana_:-- On the 6th of June, 7 _Levana_. ” 8th ” 2 ” ” 11th ” 2 ” ” 12th ” 1 ” ” 15th ” 6 ” ” 16th ” 1 ” ” 19th ” 2 ” -- Total 21 ” B. Kept in an unheated room during the winter. The butterflies emerged from the 28th of May, all as _Levana_. EXPERIMENTS WITH PIERINÆ. 13. Females of _Pieris Rapæ_, captured in April, laid eggs on _Sisymbrium Alliaria_. From these caterpillars were obtained, which pupated on 1st-3rd June. The pupæ were placed on ice from June 3rd till September 11th (0°-1° R.), and from September 11th till October 3rd in the hothouse (12°-24° R.), where there emerged:-- On the 23rd of October, 1 female. ” 24th ” 1 female. ” 25th ” 2 males, 1 female. ” 26th ” 1 female. ” 28th ” 1 male, 1 female. ------------------- Total 3 males, 5 females. All these were sharply impressed with the characters of the winter form, the females all strongly yellow on the upper side, the males pure white; on the under side a strong black dusting on the hind wings, particularly on the discoidal cell. One pupa did not emerge in the hothouse, but hibernated, and gave in a heated room on January 20th, 1873, a female, also of the winter form.