UTAH ACADEMY OF SCIENCES 265 
graphic comparison with the Grimes Pass data they are 
also plotted in Figure 1. It also appears to bear out 
Pearson’s conclusions as well or possibly better than it 
does hisown. Following his conclusions one should also 
expect to find a small amount of growth in 1912 following 
the low precipitation of 1911. On the other hand, the 
high growth rate in 1912 is accompanied by a heavy rain- 
fall in April and May of the same year. Furthermore, 
it is difficult to conceive how the carbohydrates elaborated 
and stored during the preceding season are adequate for 
the main growth of the current season. It appears to the 
writer more logical to consider that the stored food 
materials are largely, if not wholly, consumed in the incip- 
ient stages of the current growth, and that, because the 
moisture originating from the winter snows has been 
largely dissipated, the amount of precipitation falling in 
April and May is largely responsible for the growth 
during the main part of the growing season, and there- 
fore, largely determines the total amount of growth fora 
given year. 
