334 PROCEEDINaS OF SOCIETIES. [^^SSal.^eTl'ff 
was accurate, being what geologists would call the bluff-and-tail 
escarpment ; and that the other portion under the spherules has a 
definite existence, as is proved by the beautiful observations of 
Mr. Wenham, who has shown that on a dark-ground illumination 
these little spherules appear like distinct and beautiful light circles, 
and this view of the object was entirely different to that usually seen 
by microscopists. He remembered that in 1837, just after Mr. Ross 
had constructed his first ith lens, he (the President) had shown him 
the Podura scale with dark-ground illumination, when Mr. Ross was 
greatly struck by the singular beauty of the view presented. By a 
little alteration in the obliquity of the light the small spines varied 
in colour, which led him (the President) to infer that they were 
small circles upon larger ones. It is evident, however, that instead 
of this there are two membranes with an elevation between them, 
which causes the hollow cone below the spherules. The surface of 
the scale is certainly corrugated, and he believed that smaller corru- 
gations drawn by Dr. Pigott had led him to suppose that the surface 
was covered with beads. He should be glad to find that Dr. Pigott 
could confirm his own statements ; in the meanwhile, however, in the 
presence of so many different opinions, he could only repeat the 
maxim, Quot homines tot sententice. 
The meeting was adjourned until 8th December. 
After the meeting was concluded Mr. Mclntyre exhibited under 
the microscope the well-known test-scales of Lepidocyrtus curvicollis 
and Degeria domestica^ and the following live specimens of the insect, 
viz. Temjpletonia, Lepidocyrtus macrotoma, and Degeria BecJcii. 
Donations to the Library and Cabinet from October 13th to 
November 10th, 1869 :^ 
From 
Land and Water. Weekly Editor. 
Scientific Opinion. Weekly Editor. 
Society of Arts Journal. Weekly Society. 
Nature. Weekly Editor. 
The Student Publisher. 
Alcuni Oenni Sovra Studio dei Corpi Frangiati Delle Kane 
del Professori G. B. Orivelli e Leopoldo Maggi . . . . Author. 
Intorno Alia Produzione del Leptotlirix nota dei Professori 
G. B. Orivelli e L. Maggi Author. 
Sulla Produzione di Alcuni Organism! Inferiori in Presenza 
deir Acido Fenico. Professori G. B. Orivelli e Leopoldo 
Maggi Author. 
Sulla Produzione del Bacterium Termo Duj. e del Vibrio 
Bacillus Duj. dei Professori G. B. Orivelli e L. Maggi , . Author. 
Sulla Derivazione del Bacterium Termo Duj. e del Vibrio 
Bacillus Duj. dai Granuli Vitellini dell' ovo di Polio 
nota dei Professori G. B. Balsamo Orivelli e L. Maggi , . Author. 
The Ohemical News. 6 Nos W. T. Suffolk, Esq. 
Quarterly Journal of Geological Society Society. 
An Amici Keflecting Microscope by Outhbert Dr. Millar. 
Four powers for the above The President. 
An improved Double Nose-piece Mr. C. Collins. 
Half-a-dozen Slides of Insects' Eggs Mr. J. T. Norman. 
Walter W. Reeves, 
Assist, -Secretary. 
