272 
PROCEEDINGS OF SOCIETIES. 
The President thought the general opinion expressed was deci- 
dedly against making glasses as toys. Opticians were guided by 
demand ; but then Mr. Richard Beck used to say that their best cus- 
tomers were the people who did nothing at all. He hoped that the 
discussion of the subject would tend to lead makers to produce really 
good objectives with a happy medium of angle. What they wanted 
was a glass really suited for the purposes of research. 
Donations to the Library since April 7, 1875 : 
From 
Nature. Weekly The Editor. 
Athenaeum. Weekly Ditto. 
Society of Arts Journal. Weekly Society. 
Journal of the Linnean Society. No. 79 Ditto. 
The Canadian Journal Institution. 
La Teoria della Riproduzione delle Diatomee. By Conte Francesco 
Castracane Author. 
Le Diatomee nella eta del Carbone. Memoria del Sig. Conte 
Francesco Castracane Ditto. 
Le Diatomee in relazione a la Geologia. Memoria del Sig. Conte 
Francesco Castracane Ditto. 
A box of minerals, and some diatomaceous earth in the solid state Mr. Hanks. 
H. W. Jones, Esq., was elected a Fellow of the Society. 
Walter W. Reeves, 
Assist. -Secretary. 
Scientific Evening, April 21 , 1875 . 
On this occasion the libraries of King’s College were placed at 
the service of the Society by the kindness of the authorities, and the 
attendance was very good in spite of violent rains. Excellent lamps 
were lent by Messrs. Baker, How, and Parker, and the display of 
objects equal to any former occasion, as the subjoined list will show. 
Exhibitors and Objects. 
The President, H. C. Sorby, Esq. : Some new apparatus for the 
study of the spectra, and showing its application. 
Messrs. Beck : Podura scale under an immersion ^th, with a pecu- 
liar illumination, showing corrugations and fine black lines from end 
to end of 'the scale. All sign of the note of exclamation markings 
had disappeared. 
Mr. W. A. Bevington : The fructification of Trichomanes radicans. 
Mr. Thomas Bolton: A new species of Ophrydium (0. pedicidum). 
Dr. Braithwaite : Section of leaf of Bhopala Pohlii, showing 
lignified trabecular cells between the upper and lower surface ; also 
cuticle with immersed stomata. 
Mr. John Browning: The specula of nitrate of didymium and 
thallium. 
Mr.' Frank Crisp : Ahren’s binocular microscope, with prisms of 
Iceland spar. 
Mr. F. Fitch : Tongue of Norway ant (under side). 
Mr. Fitzgerald : Selenite flowers under a new form of polariscope. 
Mr. Henry Hails : Internal casts of Foraminifera, Cliona borings, &c. 
