PROCEEDINGS OF SOCIETIES. 109 
as any lines produced by angulatum. If Dr. Wallich would favour 
him with a call, he should be most happy to show him these effects. 
Mr. Stephenson said they had only to drop a piece of card with a 
hole in it sufficiently small to exclude the spectra over the back com- 
bination, and they would instantly shut out all the lines; the out- 
line would be seen, but nothing else. If an ordinary Podura scale 
is viewed through a slit placed in a direction parallel with that of 
the markings, and afterwards through one placed at right angles 
to them, totally different effects would be obtained, and when under 
different conditions so many different effects took place it was rather 
difficult to say which was correct. 
Mr. Stephenson exhibited for Mr. Slack (who was unfortunately 
unable to be present from indisposition) a slide containing mercury 
globules mounted in balsam, the balsam having been previously 
thinned with benzoline and boiled in mounting, there being a pro- 
bability that the contraction of the globules in cooling had left a 
vacant space round each. Viewed through a micro-polariscope with 
prisms crossed, each globule appeared to be semi-transparent (like 
horn), and to be marked with a more or less defined black cross. 
Donations to the Library since December 6, 1876: 
From 
Natures Weekliyt nc Mess lua! Poche Pr) east eet Mea te ell oak eee itor: 
ANANST EDIE NCEA pee) Ga. coe cat eps sob Me odmaborne Urq l'ae Ditto. 
Society of Arts Journal . c Ditto, 
Transactions of the Watfor d Natural History Society. " Parts 4 and 5 Society. 
Journals of the Linnean Society .. Be Ditto. 
Mémoire sur les Caracteres Mineralogiques et Str: itigraphiques, &e. 
Par MM. Ch. De La Vallée Poussin et A. Renard .. .. .. M.A. Rénard. 
Abstract of Proceedings and Transactions of the Bedfordshire 
Natural History Society, 1875-6 .. .. .. «+. «. «. « Society. 
The following gentlemen were elected Fellows of the Society :— 
Dr. John A. Tulk, M.A.; J. T. Redmayne, Esq., L.C.P.E.; Matthew 
Hawkins Johnson, Esq.; and James Spencer, Esq. 
Water W. Rzevss, 
Assist.-Secretary, 
Mepicat Microscoricat Society. 
Friday, December 15, 1876.—F. H. Ward, Esq., Vice-President, 
in the chair. 
Rodent Ulcer.— Mr. Golding-Bird read a paper, illustrated by 
drawings and specimens, upon this subject. Having reminded his 
hearers of the generally accepted clinical characters ‘ascribed to the 
disease, he proceeded to analyze the cases published by the principal 
writers upon the subject from the time (1827) of Dr. Jacob, of Dublin. 
Referring only briefly to their clinical aspect, he dwelt upon the 
descriptions given of the histological appearances, but it was much 
to be regretted that so very few of the large number of cases reported 
had any thoroughly reliable microscopic analysis. 
From this he, however, concluded that the principal English 
Re 
