591liydrutropic salts such as sodiuin benzoate or sodium xylene sulfonate, sodium iodide was relatively ineffective as a solulilizing agent, giving only a 10% increase in acrylonitrile solubility even in the absence of alkalies. These workers observed that at higher alkali concentrations, the acrylonitrile was &dquo;salted out&dquo; hy the sodium iodide-sodium hydroxide mixture more readily than if no sodium iodide were present. > Their solubility measurements were made at 25°C, while the cyanoethylation was conducted at 60°C. It is, of course, possible that at the higher temperature, sodium iodide would show appreciable hy-drotrol>ic action for acrylonitrile in the 2.3% sodium hydroxide used for cyanoethylation. Evidence on this question is still lacking.'Vhether alkali iodides exert appreciable soluhilizing effects on benzyl chloride is unknown. At the high concentrations of alkali ( 18-23% ) used in benzylation, the existing evidence suggests hydrotropic effects would not contribute significantly to the observed catalysis, though they might offset salting-out effects which would otherwise prevent the catalysis from occurring. _ ' ' Acknowledgment The authors wish to express their appreciation to members of Textile Testing Investigations for the breaking strength determinations included in this report.

The state of the art of virus recovery from water is reviewed and illustrated with an actual example that posed several difficulties.

No abstract