294 



STUDIES ON BIOLUMINESCENCE. XTV 



TABLE JU— Continued. 



all degrees of relationship as regards Cypridina. The results are best 

 expressed in the form of a tabulation. In this table the words ''luci- 

 ferin" and "luciferase" are used to indicate extracts so prepared that 

 they should contain luciferin and luciferase, provided these substances 

 are formed by the organism in question. Table III represents the 

 results of experiments performed at various times during the past seven 

 years in all parts of the world. Its incompleteness is due to the dif- 

 ficulty of obtaining luminous animals in sufficient quantity for the 

 test in question. 



