302 F ;i i r c ]i i 1 d : A perforated porcelain cylinder as washing apparatus. XII, 3. 



The form whicli has proved most convenient for all ordinary 

 material is that re})roduced natural size, in the annexed figure. ^ 



In Order to wasli out fixed material, it is placed in the perforated 

 cylinder, the cork is inserted and the whole is placed in a vessel of 

 the washing- fluid deep enough to allow the cylinder to Hoat. If 

 running water is required the vessel is placed under the hydrant 

 and allowed to continually overilow. The cylinder tloats about in 

 the running water and ditfusion takes place very rajjidly through 

 the numerous perforations , especially of such lixatives as have a 



specific gravity greater than water. 

 The danger and inconvenience 

 incurred in the use of expensive fixa- 

 tives by removing the objects to 

 the washing fiuid with a hone spa- 

 tula or other device are overcome 

 by the use of these perforated cylin- 

 ders. The objects to be fixed are 

 placed immediatily in the cylinder 

 and the latter is then dropi)ed into 

 a stoppered glass vial having a dia- 

 meter greater than that of the cylin- 

 der, which contains the fixing fluid. 

 When osmic acid is present in the fluid the cork of the cylinder 

 may be removed l>efore lowering it into the glass vial to prevent 

 the absorption of the osmic acid by the cork, care should in such 

 cases be taken that the fixing fluid in the vial does not rise higher 

 than the mouth of the perforated cylinder and float the objects out. 

 In dehydrating, the objects need not be removed from the cy- 

 linder but the latter, holding the objects, may be floated in a closed 

 vessel coutaining a large quantity of alcohol. If good sized vessels 

 of grade alcohol are prepared the work of transferring from grade 

 to grade is reduced to a minimum. The cylinders are simply trans- 

 ferred from one bottle of alcohol to the next of a higher grade. 



For collectors these cylinders will prove quite acceptable no 

 doubt as they admit of fixing a large number of specimens in the 

 field in separate packages, washing, and dehydrating them without 



') C. Gerhardt, Marquart's Lager chemischer Utensilien, Bonn a. Rh., 

 Bornheiraerstrasse 90 had a number of these „Sieb-Eimerchen" manu- 

 factured for my use and is preposed to furnish them for 30 Pfennige per 

 piece when lots of at least 100 are taken. 



