Rees ONIN Cab" 3 
A discussion followed in which Dr. W. J. Houianp said 
that he had not noticed this tendency to orientation. In the 
case of Colias philodice and other Pieridx, he had observed 
that they assumed all manner of positions, so that it was not 
safe to extend the observation presented by Professor Poulton 
to such species. The PresrpEent asked for information on the 
resting habit of Selenia bilunaria, and remarked that it differed 
in his observations from that of S. tetralunaria and the other 
members of the genus. Mr. C. O. Waternouse remarked that 
he had noticed that butterflies always turn fo the sun, so as to 
expose the greatest amount of surface to the warmth. Mr. G. 
C. CHampion also mentioned that when collecting in the 
tropics he found that a dead butterfly exposed to the sun’s 
rays at once shrivelled up. Mr. C. J. Gauan, Dr. F. A. 
Dixey, and other Fellows also joined in the discussion. 
Wednesday, June 7th, 1905. 
Professor E. B. Poutton, F.R.S., exhibited leaves of straw- 
berry, Berberis japonica, and cherry-laurel which had been 
sent to him by Mr. W. B. Grove, of Handsworth, Birming- 
ham. The leaves had been attacked by minute fungi which, 
in the strawberry and Serberis, had been identified by Prof. 
8. H. Vines, F.R.S., as Phyllosticta fragaricola and Phyllosticta 
japonica, respectively. The clean round holes in the laurel 
leaves had been caused by a fungus identified by Mr. George 
Massee as Cercospora circwmscissa, Sace.,—the “ shot-hole 
fungus.” The attack was local and followed by the death 
and disappearance of the central portion of the leaf-tissue of 
each patch, leaving a roundish or oval window outlined with 
brown, sometimes in the form of a narrow line, sometimes 
spreading peripherally into the leaf for a greater or less 
distance. In the strawberry the edges of the windows were 
somewhat ragged, but those of the other two leaves had 
smooth contours, and strikingly resembled the oval trans- 
parent areas upon the fore-wings of Kallima inachis, paralekta, 
etc.—surrounded most conspicuously with a marginal zone of 
modified colour varying greatly in different individuals as 
