1901] MICROSCOPICAL JOURNAL. 117 
Ly in different localities, so the author made experiments 
with the market butter of Vienna. He used the Ober- 
mueller method, ejecting the centrifugated melted butter 
into the abdominal cavity of animals. In all, he inocu- 
lated forty-five guinea-pigs, and not one died of true tu- 
berculosis or showed signs of the disease ; one case proved 
to be pseudo-tuberculosis. Ten animals died of perito- 
nitis, but none injected with margarin died from perito- 
nitis. In the case of pseudo-tuberculosis he found a long 
acid bacillus taking Gram’s stain, and which he considers 
the cause of pseudo-tuberculosis as well as Petri’s and 
Hormann-Morgenroth’s bacilli.—Wed. Age. 
THE CHEMISTRY OF CANADA BALsaAM.—Tschirsch (Archiv 
der Pharm) publishes the results of his researches on this 
balsam. He finds the acid in a number ofsamples he has 
examined to lie between 82.2 and 86.1. The saponifica- 
tion number varied from 194.2 to 197.7. Among the re- 
sin acids present he finds canadinic acid, Cy Hy, O2, and 
canadolic acid, CygH2g0,. Two isomeric amorphous acids, 
a- and b- canadinolic acids, were also found to be present 
in considerable quantity. ~Canaderesene, Cy.H4 0, was al- 
so isolated. By the distillation of the balsam with steam 
a small quantity of an essential oil, boiling between 160° 
and 167° C., was obtained. 
eee 
MICROSCOPICAL SOCIETIES. 
SATURDAY NieHt CLuB oF Microscopists.—A recep- 
tion of the Club was held at Franklin Institute Hall,Phil- 
adelphia, on Saturday, December 15, 1900. There were 
present, besides the regular Club members, a large num- 
ber of invited guests. The speaker of the evening was 
introduced by the President, Dr. Joseph C. Guernsey, 
with the following remarks: “It is the custom of our 
Club to occasionally invite outsiders, that they may ,en- 
joy with us some of our rich intellectual feasts; and we 
