130 



Journal of Applied Microscopy. 



B A 



Fig. 18. Wasliing apparatus for tissues fixed in osmlc acid, etc. 



the receiver. This skeleton, inside box 

 is divided up into a dozen compartments 

 and for each a little basket is prepared. 

 The tissue is put into the little baskets 

 and they are placed in the compart- 

 ments as shown in the figure (Fig. 18 A). 

 The outside box is about 1 centimeter 

 deeper than the inside one and the wa- 

 ter runs in at the bottom and out over 

 the top. This insures a constant change 

 of the water, and as the water enters 

 at the bottom it must pass through the 

 perforations of the inside box and of 

 the little basket before coming in con- 

 tact with the tissue; it can be seen that 

 the current is very gentle when it 



reaches the tissue. This apparatus has 

 now been in use about six months and 

 has proved very satisfactory. The 

 washing apparatus shown in B, will be 

 described by one of my students in a 

 later issue of the Journal. 



For heating gelatin for injections and 

 paraffin for filtering, etc., a combined 

 receptacle and water bath was devised. 

 The cut shows the construction. 



For the filtered paraffin that is to be 

 used for imbedding, a combined water 

 bath and receptacle was devised in 

 which the water bath nearly surrounded 

 the paraffin receptacle as shown in the 

 cut. For a large laboratory the paraffin 

 receptacle should hold about one liter. 



Fig. 19. Combined receptacle and water- 

 bath for melting paraffin, and for gelatin 

 injection masses. 



Fig. 20. Paraffin receptacle with water- 

 bath, and spout for paraffin imbedding. 

 P — Paraffin. 



In filtering paraffin and gelatin some 

 form of hot filter is necessary. The 

 form here shown has worked admirably. 



