24 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



average rainfall for 1850-1897 than for 1898-1941. It was obvious 

 at once that the greater rainfall of August aided by that of July caused 

 the greater average rainfall of January-August during 1850-1897 at 

 Santa Fe. In September, as a matter of interest, the averages swing 

 back so that the figures are 1.58 inches for 1850-1897 and 1.66 inches 



Table ii. — Average rainfall (inches) 



March-July 

 1909-1041 



Chacon 10.34 



Black Lake 8.42 



Taos 5-96 



Taos Canyon 9-64 



Las Vegas 9-33 



Santa Fe 6.88 



Albuquerque 4.24 



Santa Fe 



i8qo- 1898- 

 1897 1941 



March-July 6.34 6.74 



January-August 10.60 lo.ii 



January-May 3-94 4-82 



March-April 1.54 i-92 



May-June 2.14 2.61 



April 0.71 1.08 



May 0.99 I-I9 



June 1. 15 i-i8 



July 2.66 2.21 



August 2.89 1.90 



September 1.58 1.66 



Albuquerque, 1850- 1897, 27 years of record only. 



for 1898-1941. This situation no doubt should be given emphasis: 

 the average rainfall for the interval March- June began to increase 

 somewhere near 1898 whereas that for the interval July- August 

 decreased. Calculation shows that the average for March- June began 

 to increase slowly just before the turn of the century and that the 

 increase accelerated after 1909, The simultaneous increase and de- 

 crease of two sequential month-intervals is a point of importance in 

 relation to the period of greatest tree growth within the season. 



