NOTES AND QUERIES. 57 
Briggate, Leeds, are now producing small dynamo-electric machines, 
ranging from £5 1os., upwards. One of our correspondents in- 
forms us that one of these machines of lowest price will just keep 
in good order one 20 candle power Swan incandescent lamp. 
STAINING NucLe1—At a meeting of the Société Belge de 
Microscopie, M. Errera stated that the anilin color nigrosine was 
an excellent reagent for staining nuclei. He showed some sections 
of vegetable tissues, colored with this substance, in which the nuclei 
had taken a very pronounced blue coloration, which admirably re- 
vealed the details of their structure, while the rest of the cell 
remained unstained. The sections to be stained are allowed to 
remain in the aqueous solution of nigrosine for a short time, and 
are then washed in water until the liquid extracts no more color. 
They may then be mounted in glycerin, or else passed through 
alcohol and mounted in balsam or dammar in the usual way.—A. 
M. M. /. 
A New PatHocenous Baccitius.—Prof. C. J. Eberth recently 
found a new form of Lac//us in a badger’s liver. They occurred 
in the pus-corpuscles in small abcesses, which they appeared to 
have caused by penetrating through the capillary tubes, and pro- 
ducing necrosis of the hepatic tissue. Some were also found in 
other organs. These Aacilli have the form of cylindrical rods, 
occasionally consisting of two segments. Staining with iodine 
solution or Bismarck brown shows the presence, in some cases, of 
dark brown granules of uncertain nature. The specimens were 
obtained by placing thin sections of the liver in a solution of 
methyl violet, then leaving them in water acidulated with acetic 
acid till no more colouring matter was removed. After passing 
through alcohol and clarifying with oil of cloves, the sections were 
mounted in balsam. In this way only the nuclei of the liver cells, 
the pus-corpuscles, and the Baci/i were stained. 
VoLvox Minor.—According to Kirchner, the following is the 
mode of germination of the oospores of Volvox minor. In February 
the endospore swells up, while from the ruptured exospore issue 
the contents of the oospore in the form of a sphere, which subse- 
quently separates into four cells connected with each other at the 
posterior end. A new family springs thus from each oospore. It 
is also found that Volvox minor is not dizecious but proterogynous, 
the families passing first through a female and then through a male 
condition. 
ErratuM.—On page 17, line 7, for “B or even higher ocular” 
