Duggar — delation of Marine Algae to Salt Solutiojis. 483 



tables.* Moreover, the metals then arrange themselves in 

 the order of NH4, K, Na, Ca, Mg. Indeed, when the tables 

 are carefully studied, it will be seen that in the results ob- 

 tained at Woods Hole, there are no exceptions to this order 

 in the averages, although in the case of the chlorides, K, Na, 

 and Ca are almost equal in toxic value. In the work done at 



Cette, Table VI, the only exception is that Na and Ca change 

 places in the case of the nitrates. In this case, however, the 

 difference is not great, and, furthermore, the toxic value of 



* No acid reaction was shown after the preparation of the solutions. 

 Acidity tests were not subsequently made. 



