430 H. p. KJERSCHOW AGERSBORG 



The chemical response to quinine sulphate is shown in the table 

 to be from — g to — . The same individual which ate 50 mm. 

 treated with quinine, ate 20 hrs. earlier 25 mm. food treated with 

 2 M NaCl for 15 min. That is, my data show this animal ate 

 on the average for six days 51 mm. per day, the food being treated 

 in various ways; or, it ate ca. 3.23 mm. more than the average 

 of five individuals, but its records show it ate some each day, i.e., 

 from 25 to 85 mm. each day during the week. It may be, there- 

 fore, that specimen d was in a better physiological condition at 

 the time when it took a full meal of food, e.g., 50 mm., which the 

 others would not do. An individual which in a morning did not 

 eat from the food treated with M ethyl ate 10 mm., in the after- 

 noon, of food treated with 2 M methyl; on the next morning it 

 was dead, however. The chemical response to methyl was — 

 (vide ut infra tabula) . It is then seen there is a definite relation 

 between the sensitivity of the external parts of the organism to 

 certain chemical solutions, and the taste of the organism, e.g., 

 quinine sulphate gives a response from — g to — , the organism is 

 careful about eating food treated in such a solution. If hungry, 

 it may eat it at once; if not hungry, it may bite at it (taste it?) 

 and then either eat only a little, void it, or avoid it altogether. 

 (N. B.^ — It is to be noted that the food was left with the individual 

 up to one minute, after which time it was removed in all cases.) 

 The most interesting results were obtained by using broth of 

 various animals, e.g., of jellyfish, sea-urchin's gonads, etc., and 

 oils. I also used an emulsion prepared from raw jellyfish and 

 from the gonads of sea-urchins. The reaction was positive for 

 all of these, but more so for the cooled broth. Applying the 

 emulsion or broth with a pipette on the dorsal tentacles, Her- 

 missenda turns round apparently in search for the stimulus; 

 applying the stimulus in front, it makes progressive movements 

 toward the stimulus and bites in the pipette and works the 

 oral apparatus continuously. When broth of the sea-urchin's 

 gonads is apphed onto the top of the head or on the dorsal ten- 

 tacles the response is not really definite, the organism seems to 

 be confused; but when the same amount of broth is let a short 

 distance (5 mm.) in front, it moves toward the same and starts 



