Vil 
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BLO TIO S Ural Ca erate mt Nee eats een MeN neem aae se Scay go ihe id aie ste he levti eles fee tnsdas DBS 
Biranichio pod aleevemrs cine cis eet ig ca shevessan cus 8 che sobs lows aes Sz bse ahs 222 
Clad OCeraemetr yeep Cra Teo MES ate ice o Catster a nya halts Seta wher ae 223 
Cladocera and Hydrographic Fluctuations (Table).............. 223 
DISCUSSIONIOL BSPECIESH ae sic arta rabies ia om Rr oe che he bas sae 223 
Tabular statistical data :— 
Bosmina and hydrographic fluctuations....... sok woes 228 
Seasonal distribution of Chydorus. Average ee raber per me. 235 
Effect of temperature on numbers of Chydorus........:....... 238 
A typical pulse of Daphnia cucullata. . whe ee 242 
Diaphanosoma population, with data oa erat ere river 
LCC ey eee eR cae ete en ni t= Mines, Sue S04 5 Se easel, We) ei haewaee 248 
Momarand ny drocraphicichangess. 2.24. 2450-22-25. .50- ees 254 
OS tira Ocl aierewere cree eee ek area: ee ems eee ec le Ger eho vd nat otto evn Blane gee 257 
ID SeMCStOMe Ol SPECIES Es nate Py eames Hin cars ee: oYel rnd whbin seanboe ants 258 
Cope pod dancer eke oo fo Aer eee Doe evict qt age ee hes 258 
Copepoda and Miydrographic Changes (Table)... 6 oc... 5 cee ses. 260 
DISCUSSION RO MES DECIES Hen gratin: on ieie ie ae Rosie tes = MS eS coh ants oa © 261 
Cyclops viridis var. insectus and Hydrographic Changes (Table).. 274,275 
Relative numbers of adult, young, and larval Cyclopide (Table)... 278 
FANTINI Canny Meme Ma yeas, iar Med enne ne for) ca NE tae nt a sie teen orleans 283 
ANSRAYC\OWANIGIEY S 6:6 230-4 4 A cuicesua tare Sabai S leven Grou e tito ea cece red cone eRe eta ee 283 
ANCBITUIDE LS odo ovcks Ot eicRere Cate Oe: yea Cee ERE Oe ner eee 283 
plein cli once cla pee rca ete ty ce) NCR AMS cttsy asec coiled PS eS ncos aks 5 fc leo ets 284 
PROC TDOC MIE pai temtastt s Mole © a oteet es 2s gatos tetant claieue Aides <i gem eleye Ais 284 
EOE Te Te Cl eee een ok eens eer eeeeas ae ae ae te MN Aen. can SETS, tore apis hg is 285 
RSM et cltecereg eee eyes ee Se acc Terk ass a tae, Bom = lenets tan eh nan? eis Sentmy sn eaoes 285 
Diptera ete mew ery eme as 4) ep eee eR ne es uaa tae ee 285 
IM MOMS 5, 65 a5 ole tiene CHR OCA RU CORRE CHER ORG Ie tara ocean gt ae een 287 
Gastropoda... ..... Po ct ert ge oR Pe ge RTE ce me eae 287 
Warm ellilo ram cli ata cwynn pe eB. Mepedeg a7 Se coet cae hus oe eredeta ued. o alle aleTs 287 
IBNFOLAO EN o0n.6 salle 6 °G tiey ee a cence ee eC MG BURL GPEC EO eich Cc OR eenaeMCn? Cee emce aie 288 
IBIS CHSSIOH Olen OPECES = rir Sea cte docs Gg ele ounces 3) oe 4 odie eae he 288 
The Periodicity in the Multiplication of the Organisms of the Plankton... 291-311 
Comparison of Plankton Pulses and Lunar Cycle (Table)............. 296-299 
Cascousi@ontents of Lond Water i(lable)in. 2 ot.cn «assem pee ele: eae 306 
Relation of Pulses of Chlorophyll-bearing Organisms to Lunar Cycle 
Miva) ep ire wean Rea a aetna reese <i caaatina a kts Gye a Tats Gone B 308 
GeneraliConsiderationsion) seasonal (Changesae...- ci acl eee ee eae Sly 
He Mee RECS SIRI VIED A TIIGEOMM oso) .eve Botts) «1 x cies g Wie Sch evden, oud clio ave ond @ se oa eto = 312 
Organisms per Cubic Meter in Plankton of Illinois River in 1898 (Table).. 314-340 
EPIL AE ATO NG apart ets ea i ha Pe a Sse) lense pe svat t ed Sree Os! a vinls me eo kee 341-354 
Beeler anit OnmO falelatesammuntys ca ys ieee mond Screens iartvsrercran hoe ee sai eases 355 
igerams of Seasonal Distribution... ....s2..-.6: 2 oes< lesb ee cus sus 356-360 
aE P CLINE NG CLCING cities Syn apes ys aus tes seer els isis cust e Mets k ALL A Mtlowes oer 361 
