with pepsin digestion rather than to the use of sodium bisulphite, for 

 this preservative was used successfully in other preparations 

 (Nos. 264, 279, etc, ), 



The above results, indicating that the attractive qualities 

 are not lost when the materials are preserved in chemicals, are in 

 accord with those obtained with our own preparations which were 

 tested at an earlier date. Skipjack viscera extracted with water and 

 treated with 2-percent sulphur dioxide (Nos. 140, 141), with 2-percent 

 sulphuric acid (No. 144), or with 2-percent phosphoric acid (No, 145) 

 were still attractive to the fish even after being kept at room tempera- 

 ture for several days, 



RESPONSE TO CHEMICAL COMPOUNDS 

 AND MISCELLANEOUS MATERIALS 



As time pernnitted, a variety of chemical compounds 

 ranging from amino acids to proteins and including vitamins and vari- 

 ous miscellaneous aromatics were tested as follows: 



Arginine (No, 32, 103) 



1-Asparagine (No, 102) 



Creatine (No, 109) 



1 -Glutamic acid (No. 191) 



Glycyl-glycine (No, 127) 



1-Histidine monohydrochloride (No, 192) 



dl-Isoleucine (No, 34) 



1-Leucine (No, 44) 



Methionine (No, 157) 



dl-Norleucine (No, 45) 



dl- Phenylalanine (No, 31) 



dl-Serine (Nos, 51, 56, 101, 104, 108) 



1-Taurine (No. 42) 



34 



