16 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION 



RESUME 



A new principle in dosage relationships produces a simpler form 

 of dosage tables than any hitherto known. 



The common tables are grossly inaccurate in their method of com- 

 putation. 



Extremes in shape show inconsistencies as high as 33%. 



Both high and low trees are given relatively much weaker doses than 

 'trees of medium size. 



Percentage adjustments for varying degrees of leakage exhibit the 

 same faults in the common tables as shown regarding sizes of trees. 



The most important improvement to come in fumigation practice 

 is the general adoption of correct allowance for tent leakage. 



All three sources of error may contribute to the production of a 

 very faulty estimate of dose or may compensate each other and all 

 tables are practically sound for medium conditions. 



The construction of the new tables involves no mathematical diffi- 

 culties except for the calculation of the series of 18 sizes. 



The tables are exceptionally simple, legible, not liable to confusion 

 and allow for all needed variations of strength of dose. 



UNIVERSITY of CALIFORNIA 



AT 



LOS ANGELES 

 LIBRARY 



