122 



INFLUENCE OF TEMPERATURE ON BIOLOGICAL SYSTEMS 





CD 



O 

 O 



UJ 

 C 



=> 



v> 



V) 



a. 



ARBACIA 

 PUNCTULATA 



/ MEHSALYU ACID 



LESS THAN 15% 



CLEAVAGE IN 

 MERSALYL ACID 



ABNORMAL CLEAVAGE 

 IN MERSALYL ACID 



1 



15 



20 



25 



TEMPERATURE "C. 



30 



Fig. 11. Decreases in the 

 strength of the furrowing re- 

 action induced by mersalyl acid. 

 Each point indicates the mini- 

 mum pressure level required to 

 block the first cleavage furrow. 

 Data from Landau et al., 1954. 



3.0 



O 

 V) 



CD 



O 

 O 

 O 



I 



u 

 o: 



z> 

 v> 

 i/) 

 liJ 

 a: 

 a. 



2.5 



2.0 



1.5 



CHAETOPTERUS 

 PERGAMENTACEUS 



CONTROL 



• ^MERSALYL ACID 



20 25 



TEMPERATURE 



Fig. 12. Mersalyl acid-induced 

 weakening of the furrowing re- 

 action in another egg. Points as 

 in fig. 11. Data from Landau 

 et al, 1954. 



30 



