1893.] 



MICROSCOPICAL JOURNAL. 



87 



MKROStOPK AL APPARATUS. 



W^ashing-Bottle For Microscopical Sections. — The ac- 



companving sketch of Maw's apparatus for washing sections 

 shows an arrangement that has been found to be an improve- 

 ment upon that described by Marsh in his book on Section Cut- 

 ting Instead of ch^illing a hole in the side of the liottle for 

 overflow, a siphon through the cork is used. This draws the 

 water ofl" at or near the centre and does away ahnost entirely 

 v^'ith the chance for thiu sections being caught against the hole 

 in the side — an objection to Marsh's apparatus. A is the bottle, 

 N the funnel, C the siphon, and D the india-rubber tubing 

 connecting- the funnel with the side of the bottom of the bottle. 



A Convenient Life-Slide. — The slide illustrated above is 

 placed on a turn-table and a cell of melted bee's-wax made. 

 The object is placed in the centre and a thin glass cover put on 

 and pressed down hard with a piece of thick plate-glass, other- 

 wise the slide can be inverted and pressed on any hard flat sur- 

 face till the cell is in contact with the cover all around. 



One often finds very interesting objects, and with this slide can 

 mount them so they will be ready for re-examination if called 

 away. They will remain alive and in good condition from one 

 day to a week. — Meyer Bros.' Druggist., Nov.., i8g2. 



MICROSCOPICAL MANIPULATION. 



Two Methods of Detecting Tubercle Bacilli in Milk. — In 



examining milk which is suspected to contain the tubercle bacillus, 

 it is usual to subject a sample of the milk to the action of a cen- 

 trifugal machine after separating the fat. The casein in 20 c. c. 

 of milk is coagulated with citric acid, and, after filtering, the 

 residue is dissolved in a solution of sodium phosphate. The butter- 

 fat is separated by shaking with 6 c. c. of an aqueousether solution. 



