1913. 



PUBLIC DOCUMENT — No. 31. 



57 



Summary of Table III. 



This series of experiments was conducted like the preceding, 

 except that measurements were made of the total number and 

 length of shoots and roots, which was greater in the gas-charged 

 water. The average number of shoots in the treated water was 

 32, and of those in the normal or untreated, 26, while of the 

 roots, the average for the treated water was 138 and for the 

 untreated, 32. The stems and roots in the charged Avater 

 greatly exceeded in development those in the untreated water, 

 and appeared much earlier. 



From these data it will be seen that the effects of gas in 

 increasing the number of roots are quite noticeable. Similar 

 results are shown with the total length of shoots and roots ; for 

 instance, the cuttings growing in the charged water grew longer 

 roots and shoots than those in the untreated water. It will also 

 be noticed that the total length of roots is relatively greater than 

 the total length of shoots. The average total length of the nor- 

 mal, untreated shoots was 111.75 centimeters, of the treated 

 shoots, 215.35 centimeters. The average leng-th of the normal 

 roots was 105.90 centimeters, and that of the treated, 656.35 

 centimeters. The average gain of the treated over the untreated 

 shoots was 92.7 per cent., and that of the treated over the un- 

 treated roots was 519.9 per cent. The percentage gained in 

 average length of shoots and roots in each experiment ranges 

 from 15 to over 1,000 per cent, in favor of those grown in gas- 

 charged water. 



In summarizing the results of these experiments it may be 

 said that there was little diiference in the average number of 

 shoots in the normal and treated, but the average number of 

 roots in the treated shoots exceeded those of the normal : fur- 

 thermore, the total and average length of roots and shoots in 



