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Impounding:actiona: cmt sas rreistesaeee cieeisiie cioeeteisen ieee 138 
Delay in:run-off i552. Sohioutiseb elect eeinccies cee Geel 139 
Duration of overflow2.45.c1eeuecees maine scene Cee 139 
Effect of under-drainage upon run-off and floods.............. 140 
Statistics from hydrographs at Copperas Creek and LaGrange... 144 
The normal (regimen: 325/00. F wrote sae ceren te itolereicicloratelen < haeeeaes 145 
High-waten perlodi.)f 5c 2.can ciejactepesiehis sisseistase eve be eee oe 145 
Maximum flood igiiics.cuicheeutareice eve elncie ean weclaic ctu betaee eee 147 
JME TIS! os case Ss iase acre cla ererersicievers cieloet ctsiciers efehsiers oat eke eam 147 
Low=water: periods ose se anmeeenketeh tena: ince ae aan eee 148 
Duration and stability.................... aisiesdietshals aaa eS 148 
Minor “fluctuations ace ceraciciiscr ce cietecistere sioacee ate ne 149 
Total movement and range in levels.............. 020s seeeeees 150 
Instability of fluviatile environment..... «2.0... 2.22. ee ee ee eee I51 
Description of conditions at Havana in high water............ ISI 
At low-water i) 253.2: Se IN oo ae ter 2 See 154 
Dhe river'as/aunitvof environments.) (se esters 156 
River gage-readings at Havana................-eceeee eeeeee 157 
Monthly and yearly averages of gage-readings................ 163 
Hy drograpbiciconaitionsiece stem iiiciteteloiaiastelaiecisreine ie eieieteneeeet 164 
Tit 894 5 ered siete ists chevebotare ome lever eetnele etesessieelekoiey ciety everett teiete 164 
(haGh tc) Sen eN REE rane Hh GHtio ae re am Deon Oa abe cc.cro uD BB a 164 
11 (50) eee RSNA 7 aaNet AO RORAMOtiah ke Choa c 2 165 
|v (ley MEM A rer EAR PR ay, HicHiMm NEHA nant mein Shot ode 166 
Tri 1898 ..'5/55 oS chk ane rye ceisler a Sine ae ee RE Dee Oe a ee ee 167 
5 Vi f-.0.0 RMSE ee SNR iOS SSMS NE RAR Greomeieheot 0.0 168 
LEMPEU AUT ES 0855 Nabe s ciaiNelo)elasialson ee eee els ce ae OR ER ERCU ERIE eee ee 168 
AS aifactomin the envitonmentsan.eneeeerireeacGiseeiee te eee ce nee 169 
Memperatures TECONAS a acercyaccyescetye roel ciehsioi ye eis eter estate eevee eve eteietene oe 169 
Causes of fluctuations in temperature.......... 0.0... cee ee eee eee eee 169 
Amnualjand (ditrmal rar eel yee late tetetre ocuetelel stele tetetetetelet terete tye terete tetas 170 
Monthly and ‘yearly averapes! ao. 2a. -eiee nti eitreeieni i eeceion emcee 17I 
Seasonal ‘thermograph s';...3. 00). tien nessibeiie vioietsisterete epteiaey= cieratele ieee 172 
Comparison of thermographs of different years.............. satay tro 173 
Surface and bottom temperatures. 60. 2.0.20. . veee cee weer e eee eeeeeess 174 
Instability of temperature conditions in fluviatile environment......... 174 
Absence: of thermocline’: <j: <!s:.;ss;siceleieis) ove eseeicie alee ect ie levees erste aeeree 175 
The ice blockade in relation to plankton............-..-.0-e cee ee eeee 175 
Ice conditions at Havana in 1895-1899.......- 1 see cece cece eee rece ces 176 
Other, Meteorological actors «citer eee eee eee 177 
CLOT HALL 4s RAB RE OOO ROA OR A Oaed Os seibuidar abies stttasane foie feraemame Rc recare ar eSore tee 179 
Method ofidetermination::. csseni ncn eer eee erent ae ee eee 179 
Tilimois River sit. sabek Sob ce sie oe Rae eee EEE Ee eer oen tener 179 
Spoon Riverscgc hse ls Ae eke Seabee ere eee SEO ert erent ate eestor 180 
Thompson's Walces.).ia/sj.1cj.c1s:e/n ern emi eisanee Cebateenste at eet ecietters Ie eteneLare 180 
LO}vb hi dian Iii) eee BracnRSmMnod ace coodd ichians bons oqeaddodg pane 180 
Dogfish Lalkkeninsk 7 date. new nace era eee Se OOM ROUT ATO COC 181 
Plage Laake). isi 'o'. 5 aves slob of wate es azarae avela le tet ne teyece ie eee ent ctet etc ee 181 
