1 86 



PATTERNS AND PROBLEMS OF DEVELOPMENT 



low temperature but reconstituting at medium temperature (Ia2, Ici) 

 show a much higher frequency than those conditioned to, and reconstitut- 

 ing at, low temperature (lai, Ici) and also higher than those conditioned 

 to, and reconstituting at, medium temperature (Ilai, IIci). Conditioning 

 to medium, with reconstitution at low temperature, results in great de- 

 crease in a-pieces with some deaths and decrease with many deaths in 



TABLE 7 

 Head Frequency and Temperature 

 Pieces a and c (Fig. 67) of each series from the same animals (50 pieces in each lot); fre- 

 quencies in percentages. "Low" temperature is 8°-io° C; "medium," i8°-2o°C.; "high," 

 2 7°-3o°C. 



* Second index for living pieces only. 



c-pieces (Ser. II). Series III shows the great increase resulting from re- 

 constitution at high temperature of pieces conditioned to medium tempera- 

 ture. Comparison of Ilai with Illai and of IIci with IIIci also shows 

 how slight the variation is in similar pieces from similar lots under the 

 same external conditions. 



A number of anesthetics have been found to act essentially like cyanide, 

 the same concentration and exposure period decreasing or increasing 



