ev, evi] Cote?) 
the height of the dry-season, were on the upper-side almost of 
the wet-season phase, while others of the same brood which 
had been kept in damp heat throughout both the larval and 
pupal stages went still further in the same direction. Some of 
these latter indeed, especially the females, showed on the upper 
surface the wet-season pattern fully developed. On the under 
surface the approximation to the wet-season phase was some- 
what less complete ; the most advanced examples of the effect 
of exposure to damp heat during both preliminary stages 
still exhibiting beneath some slight trace of the dry-season 
mottling. On the whole, however, very little difference was 
apparent between these artificially-produced wet-season forms 
and specimens which were shown of the normal wet-season 
phase captured in the open before the cessation of the rains, 
Dr. Dixey further remarked that Mr. Marshall was to be 
congratulated on having been the first to produce, in tropical 
species of Pierinex, results as definite and unequivocal as any 
of those obtained by the President, Staudfuss, Fischer and 
others in European lepidoptera. Mr. Marshall had conclusively 
shown in the case of the present species that the natural 
stimulus for the assumption of the wet-season phase could be 
successfully imitated under artificial conditions ; he had also 
proved experimentally that while both preliminary stages were 
to some extent capable of reacting to external conditions, by 
for the most susceptible period must be contained within the 
larval stage of growth. The conclusions foreshadowed by My. 
Marshall’s earlier experiments with 7. omphale (Trans. Ent. 
Soe. Lond., 1902, pp. 211-213) were thus fully confirmed and 
amplified. These facts appeared to be of so much interest as 
to justify their immediate communication to the Society ; he 
hoped before long to be in a position to present the results of 
a further examination of Mr. Marshall’s valuable material. 
Mr. G, A. K, Marsuatr said that his experiments showed that 
the larval period, especially in its later stages, was in Teracolus 
the period in which the insect was most sensitive to the 
above influence ; the pupa stage, which was the most sensitive 
stage in Precis, being almost insensitive. 
The PresipEnt drew attention to the extreme interest of 
these experiments, and congratulated Mr. Marshall on the 
