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Imsthewullinoispeiviers-sssencsceescensnstencensstailerssaenereaeece anes ncRPeccencrosce 216 
Ihel (Sy orefosek RUNS) igs coders esoodaueaca yo socorkiASoses années nancons ae consaeeaaiaads: 217 
thal (Oy hee ILE 2) pec sgraoonec acs nent acocengos ace asaschoancocueoosnignecbraseenccocne 219 
In Thompson's Lake.....::..:.csscsssvssesn-sesenscersscesss ceconcoycnowoaaca 289) 
Complexity of the problem......... pningasooctiotec dance aos {dacatinasasn base: 220 
Lack of a common unit Of MeaSUTEMENL.....e..essecee-eeeeeeeeeeercns sees 220 
Chemical and plankton changes not proportional........01::seesessese0 
Causes of absence of proportional correlation............. 
Plankton only a part of the total organic nitrogen... 
Utilization of organic nitrogen by plankton........ rar 
Observations on limnetic organisMS,......+-+-- se eves tiatceesires 225 
Cumulative character of growing plankton...... cEEaStES saben oeet 226 
Some correlations between movéments in nitrogenous substances 
and plankton PulS€S..----cscsenscccconsereerassecsacesrscccsesere= senenrercnns 226 
With seasonal changes in free ammonia...... {Codoncb: DeSraaReoceheRADN BaSes 227 
Comparison of plankton production with seasonal changes in oxygen 
CONSUME oi cos ssasestenesere ce cece nae rearate nce tacaeeetasscusas ser ssemeanecn arr eases 228 
Comparison of plankton production with seasonal changes in chlorine 
im Several Jocalitiestsnsssseesstees sees oetesestec eh tarernecassetencessieecler es saeeree 228 
Relation to sewage of Chicago, etc.... 230 
Chemical analyses.....10...se-seerseneree . 230 
Bacteriological examiimatioMeecsrccrces-eeneanvesiusese-locsenceed waunateesaucesese 231 
Ata vidas ce-sseccnsecnecesssee=-trtuaenesetteras teenies dssesog nena Boe HoobuanDOUeE 231 
IByoteheejereyde Woy (EAC) scaccocstanccocgces cebse noacbonseceS onocceonsecstecce 
Seasonal changes in decay of sewage at Havama.cerceeee.ssseeeeeseeeeee 
Complete mineral amalysis........- seccseeer sree cpensnanas cncones nsncands, Bender gatoos 
Comparisons with other streams...... «+... nedcatte: opobe searerss 
VER OU EIADY Tep-eeeccorpin. cceee a eopad sesaOS OSs So}oN senseneces anosadiogze bended indoser 
Characteristics of aquatic vegetation at Havana....... 
Annotated list of aquatic plants at Havana............ nen 
Vegetation at plankton stations .........:ssersseeeee donnoad sbandeyccaossccricn 
)ete) NN UerVoy sig! Sa Hos exkenes poche ode noun deance Ebsoos undsconteon qnsee oadousodsuncosb EEABodecAC 
In Spoon River=.  <..--:.0.--- crasoode Adasconee RosOneOOaAaRaahOG Oa IO oSOeS 
Tn Quiver Lake. ..ccs.cese. seceesseeessaseee- sence: envoensnretensorssessereesernencss eee 
ibay IDYoyessts|n ILEY KY acscceoodeso boson oaassuoeseoEeSorsanecoous colaoso ones: 
ier Taal os) IAN Sher $3 taeenddaccudconaddone nSatho n gisbnogsoemnedoAncuacohadesossedts on2esecon 245 
In Thompson’s Lake.. 
In Flag Lake..... 
IPM EWehe Ae) NES yrs5 ago sacpscoscooENAce se 
Relation of depth to zones... 
Inapplicability of Magnin’s classification......-..---sssesseeeneseeseereneeeaeeaes 250 
BRieter's:classifiGation, sten-seresce se cevesscedeusecusace clase et cements taamecls.|- at ceaectane 251 
QUANTITATIVE INVESTIGATION OF THE PLANKTONw..- ceseeeseeeeeeereeeeeeees 253-574 
1 PADI SYOR®- cacao adnan soantooaoecnnsancanbaacaate fb bahesorkhdostiosionrioosoonpdecsosuactodacmianace Add 253 
WEARER OE (COV TREH TTT Upce conc Coro d Ipc ap Cap ODeSADSTFICoS busoT ISHN IAE DEEN AW AI OOONDOADOIOBD 253 
Changes during progress of the work... 
Smith oblique-haul method............... 
J Ejbp a9) jel rs 000; |e she cepe-coodS HAOUrE Gos IeCcOOLLOendiorbiodn\aao ag nan aacnsnonsbcussaspAppsoncbos 
