1917] KRAYBILL—ALKALI SALTS 45 
expected, due to variations in different leaves, the results were 
not always consistent in some cases where the comparative differ- 
ences were small, but in each case a number of tests were carried 
out upon a number of different leaves until the average results were 
considered reliable for the purpose of comparing the effects of the 
various salts. : 
DATA 
Because of the similarity in chemical behavior of the alkalies 
caesium, rubidium, potassium, sodium, and lithium, it was thought 
that a comparison of the effects of their salts upon the fire- 
TABLE I 
LEAVES FROM PLATS FERTILIZED WITH MANURE ONLY 
Average number 
Average number] of seconds in- 
Salt treatment Other treatment ‘Number of tests} of seconds | creases fire- 
50 7 60 
a0. 40 Pee 
60 18 oU§ 
Se 19 we 
10 59 45 
ee 44 35 
fe. 18 Io 
9. a) aS ae 
9° eee a ae 
oe (68 Se 
= 7 oe 
