ed States Range
Reserve near the Santa Rita Mountains, Ariz.)._

------------+-----------+-----------+-----------
| | |
Den No. | Date. | Quantity. | Preceding
| | | season.
| | |
------------+-----------+-----------+-----------
| 1918. | _Grams._ |
| | |
1 | Feb. 7 | 4,127 | Good.
2 | Mar. 9 | 3,615 | Do.
3 | July 25 | 401 | Poor.
4 | Sept. 20 | 734 | Do.
5 | Sept. 21 | 2,520 | Do.
6 | Oct. 17 | 2,315 | Do.
7 | Dec. 20 | 1,247 | Do.
| | |
| 1919. | |
| | |
8 | Feb. 7 | 1,600 | Do.
9 | Mar. 13 | 370 | Do.
10 | Apr. 7 | 180 | Do.[3]
11 | Apr. 9 | 117 | Good.[3]
12 | May 7 | 298 | Do.[3]
13 | May 11 | 1,590 | Do.
14 | Aug. 8 | 5 | Good.
15 | Sept. 4 | 151 | Do.
16 | Oct. 17 | 313 | Do.
17 | Oct. 18 | 583 | Do.
18 | Oct. 25 | 3,410 | Do.
19 | Nov. 1 | 3,026 | Do.
20 | Dec. 13 | 2,816 | Do.
| | |
| 1920. | |
| | |
21 | Jan. 31 | 1,173 | Do.
| | |
| 1921. | |
| | |
22 | Jan. 1 | 2,333 | Fair.
23[4] | Nov. 7 | 1,685 | Good.
24[4] | Nov. 8 | 5,750 | Do.
| | |
------------+-----------+-----------+-----------

[Footnote 3: Changing from poor summer season of 1918 to excellent
spring growth of 1919.]

[Footnote 4: From near the Sandia Mountains, N. Mex.; others from
United States Range Reserve, near the Santa Rita Mountains, Ariz.]

In presenting Table 2, showing quantity of storage per burrow correlated
with the time of year and the character of the preceding growing season,
the fact may be emphasized that the growing seasons in southern Arizona
are two in number--early spring and midsummer. The sprin