APPENDIX 195 



directed on p. 102, for study of the six-hooked embryos 

 which will be well preserved. In common with other ma- 

 terial preserved in formalin the worms do not stain well if 

 used for permanent mounts or for sections. For this pur- 

 pose the specimens can be killed with the tapwater as 

 directed and then transferred without delay to a good fixa- 

 tive such as Bouin's solution. 



CERCLA BINDING U. S. PAT. NO. 1963447 



