19 
Considerable difference of opinion prevailed as to the markings 
on the scales, and the learned were at issue on this point. It would 
seem that there were several types. In one, longitudinal striz, or 
ridges, were crossed at intervals by transverse striz ; in others, there 
were longitudinal ridges, with puckerings, or wavings of the mem- 
brane, between them. 
Some had urged that the longitudinal strisee were of a beaded 
character, and that, in some, the lower beads could be seen through 
the structureless membrane. He had found that, when the upper or 
under surface was torn or damaged, the so-called under beads were 
lost, leading to the opinion that the (so called) beads were spectral 
reflections of the upper. This, though difficult of demonstration 
among the Thysanuride, was seen in large and well-marked scales 
from some of the larger foreign and English butterflies and moths- 
Some markings were evidently due to colour pigment; this, in some 
cases, presented a granular appearance: 
He had brought down for exhibition and illustration a large 
collection of scales, in sitw and separated, and some larger ones broken 
up to show structure ; and, by the kindness of some London micro- 
Scopical friends, Messrs. T. Curties, McIntyre, and Marshall, he was 
also able to show some very choice test scales from Thysanurida, 
Podurida, &e, 
The meeting then became a Conversazione, at which many 
very beautiful objects in illustration of the paper were exhibited by 
Dr. Hallifax, Messrs. Glaisyer, R. Glaisyer, Sewell, C, P. Smith, and 
‘Wonfor. 
Mr. C. P. Smith exhibited a very compact and handy portable 
microscope by C. Baker, of Holborn. This instrument, which was 
much admired, possessed a revolving stage so contrived that the object 
under examination always remained in view during revolution. This 
was an important adjunct, and hitherto had only been applied to the 
more expensive forms, 
Mr. J. Robertson exhibited wings of Sirex gigas, showing the 
spines. 
