624 



METHODS AND FORMULAS 



S 21-S 22 



21 PHYSICAL PROPERTIES ESSENTIAL OILS 



S 22 SYNTHETIC CLEARING AGENTS 



These materials are more usually em- 

 ployed before embedding either in wax or 

 in nitrocellulose, and data is, therefore, 

 not available as to the low^est strength of 

 alcohol from \\liich the transfer can be 

 made, since it is customary to dehA-drate 



completely before either of these proc- 

 esses. A column has been included, how- 

 ever, which shows the solubility of water 

 in these reagents (not the solubility of 

 these reagents in water) which may serve 

 as an indication of their sensitivity to im- 



