| 1.42 | 2.90 | 0.38 | 2.16
-------------+-----------+----------+---------+---------
Average. | 0.97 | 1.39 | 0.29 | 0.46
-------------+-----------+----------+---------+---------
Fiscal years:
-------------+-----------+----------+---------+---------
1905-1906 | 0.49 | 1.04 | 0.49 | 0.02
1906-1907 | 0.60 | 1.24 | 0.66 | 0.41
1907-1908 | 0.75 | 1.13 | 0.46 | 0.39
1908-1909 | 0.82 | 1.30 | 0.46 | 0.52
=============+===========+==========+=========+=========

=============+===========+==============+==========+=========
| Parking | | |
Month. | (care of | Experimental | Main | Total.
| grounds), | filters. | Office. |
-------------+-----------+--------------+----------+---------
1909.
-------------+-----------+--------------+----------+---------
Jul | $0.31 | ... | $0.15 | $2.63
August | 0.78 | ... | 0.15 | 2.92
September | 0.52 | ... | 0.20 | 3.42
October | 0.80 | ... | 0.10 | 3.33
November | 0.72 | ... | 0.20 | 3.98
December | 0.41 | ... | 0.17 | 2.69
-------------+-----------+--------------+----------+---------
1910.
-------------+-----------+--------------+----------+---------
January | 0.15 | ... | 0.10 | 3.02
February | 0.12 | ... | 0.17 | 4.52
March | 0.18 | ... | 0.13 | 2.96
April | 0.65 | ... | 0.15 | 4.58
May | 0.66 | ... | 0.20 | 3.63
June | 0.84 | ... | 0.16 | 7.86
-------------+-----------+--------------+----------+---------
Average. | 0.58 | ... | 0.16 | 3.80
-------------+-----------+--------------+----------+---------
Fiscal years:
-------------+-----------+--------------+----------+---------
1905-1906 | 0.01 | ... | 0.09 | 2.14
1906-1907 | 0.09 | $0.03 | 0.04 | 3.07
1907-1908 | 0.21 | 0.09 | 0.10 | 3.13
1908-1909 | 0.40 | 0.01 | 0.15 | 3.66
=============+===========+==============+==========+=========

The two preliminary filters were operated at a rat