1899] MICROSCOPICAL JOURNAL 81 



cell, slightly overfill the cell with glycerine and put in 

 the prepared object, place on the glass cover (previously 

 tested to fit), press down the centre and edges of the cover 

 until it is firmly in position, and with a damp brash 

 gently remove the expelled glycerine. Test again and see 

 by slight pressure that the cover is on the cement, and lay 

 aside to set. The next day, the slide may be washed un- 

 der the stream of an ordinary water tap, and when 

 thoroughly freed from all traces of glycerine and quite 

 dry, you should turn a layer of the cement over the cell, 

 embracing the rim of the glass cover, and finish to taste 

 (zinc cement is a strong finishing medium). This slide 

 will then be found to be well sealed and the fluid perma- 

 nently confined. All these directions apply to mounting 

 objects in oil or fluid Canada balsam, excepting the use of 

 water to clean them. The superfluous oil or balsam must 

 be removed by a brush dipped iu benzole, the brush being 

 continually wiped between the folds of a cloth. 



This cement is invaluable for securing glass covers on 

 dry mounts. It does not run by capillary attraction, and 

 absolutely prevents all finishing cements from entering 

 the cell. It dries almost instantly and with the least pos- 

 sible internal evaporation, thus nearly always preventing 

 cell dew. The result of the use of this cement for cell 

 making, and the confining of objects in fluids generally, 

 is beautifully perfect and reliable, and it saves more than 

 half the labor usually required to obtain inferior results 

 by other media. 



Bacillus Tuberculosis Stained by Sudan III. 



MARION DORSET, M. D. 

 This dye is insoluble in water, soluble, however, in al- 

 cohol with a red color, also in the various essential oils, 

 in chloroform and xylol. Fat once stained with this ma- 

 terial can be decolorized with difficulty. Daddi, who 



