Ch. XI] 



PREPARATION OF TISSUES 



369 



used for microscopic study it is a great advantage to bring the fixer 

 in contact with all parts of the body quickly, and that is done by 



Fig. 216. Washing Boxes for Tissues Fixed in a Liquid Containing Mer- 

 curic Chlorid. 



(From the Journal of Applied Microscopy). 



T Small stop cock or pet cock in the usual water faucet so that a small stream 

 may be drawn without interfering with the large faucet. 



Only the larger trays are now used, the perforated inner tray being deep or 

 shallow as needed. 



washing out the vascular system with normal salt solution and then 

 filling the vascular system with the fixer. This method of "fixation 



Fig. 217. Metal Washing Boxes for Tissues Fixed in a Liquid Contain- 

 ing Mercuric Chlorid. 



(From the Journal of Applied Microscopy). 



The deeper box is now used only and depending on the size of the pieces to be 

 washed the shallow or the deep perforated trays and tissue baskets are used. The 

 deep tray serves for washing slides with Weigert and other stains which must be 

 in water a long time. 



