







249 
1897 | 1898 
| | 
Date | ee | Temp. | Dap | Date ae Temp. Des ae 
| aAnOSOMaA anosomMma 
| eee 
July 14 | 6.30 | 79 160 || July 12 | 7.00 78 60 
91. 5090 | Bird 960 (E10 || A701 84 40 
“ 30] 4.60 | 84 | 4,720 96 | 2.90 | 80 8,580 
as 10 | 2:30 | 80.8 | 7,600 || Aug. 2] 2.70 |. 78.3 6,960 
“49 | 400 | 79 | 7,420 | Ue Oe|| 3220) 1) 983 360 
ey oa\ 150.) 77-5 |. 5,120 || © <16.| 3.70: | 77 60 
31] 1.80 | 80 | 11,000 SG) |e A201) 9 82 1,020 
pee He) a ag, 3 00:. | Rss. |? 2, $90 
Septyw |staso- | 80 7,600 || Sept. 6 | 4.70 | 79 240 
sey etO0 | 83 4 | 4,500 le aig 2 a0. | 62e5 1,800 
Cee 2.00r |) 71 | 2400 20u e428 23 960 
meee | | Ce? yen oG) a (NK73 400 






the rise in river levels. Prior to that date hydrographic changes 
are slight. With falling levels and higher temperatures after 
September 7 there is a slight recovery in Diaphanosoma—trom 189 
perm. om the 5th, to 1,053 on the 12th. 
In 1896 a well-defined heat pulse culminates August 10 at 86.5°; 
and Diaphanosoma,on August 8 at 14,260, with an abrupt depression 
from 7,440, on July 28, to 160, on August 3, in flood waters. The 
decline of this pulse from the maximum on the 8th to 440 on the 29th 
is attended by a uniform decline in temperatures from 86° to 74.3° in 
fairly stable hydrographic conditions, that is, declining river levels. 
In 1897 there are two well-defined summer heat pulses, one 
culminating August 3 at 89°, and the other September 14 at 83°, 
separated by a depression to 77.5° on August 24. The crest of the 
Diaphanosoma pulse likewise has two apices, the first culminating 
at 7,600 on August 10, followed, during the decline in temperatures, 
