Vil 
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PUPUQMAOSITACH oes ENA ciel cs Nee ane ad oe Pedal b a gee EP dk ety wale es Zan 
Hove cueeie AO OGRE ee nee tetas GRC ola fasecrahe feats Sa. Ales ate aks Oe VRS ae We aes 222 
MSO Sale Mee AA Pe aks a Atiieh a i Shae a aS el Sled vw eo 223 
Cladocera and Hydrographic Fluctuations (Table).............. 223 
iE ASCE SNIOIA. OF SOG CIES Beene CaO te oar a ee eae 225 
Tabular statistical data :— 
Bosmiuma and hydrographic fluctuations: ..:....00....60....05% 228 
Seasonal distribution of Chydorus. Average number per m.°... 235 
Bitect of temperature On numbers of Chydorus......6..08..0-- 238 
A typical pulse of Daphnia cucullata.. Ry : Erte 242 
Diaphanosoma population, with data Bf: fete ra fare and river 
WENO esc. 5 Bos ck DAS occa Recetas 248 
Miornorand hydrooma pic CHANGES: 4.55055 <b cuhbae cae od ns ones 254 
OSB ECISIE) eve ae ah Bie oe, RNR Cae Ree eae eae aa a a, a 257 
eI SIGiinCe SPECIES cy Nee We oe Alcs pe) rte hie Slit yee Sea mane eG 258 
oa og Cie ere eee es Pan as ean eel Ped Bie AES Sasharal Sus Sarah See WA 258 
Copepoda arid Hydrographic’ Changes (Table)....%.¢......¢.... 260 
SIO ECEs SIC CIES a7 he need atm ear el esl a bcm sascha) De dre ay. Kise 261 
Cyclops viridis var. insectus and Hydrographic Changes (Table)... 274,275 
Relative numbers of adult, young, and larval Cyclopide (Table). . 278 
PRANTL CUIEYCCOLE! <o Ounce CMY Ena Pear RON EON See ee Ca oe 283 
Oi TORN PRI eer SL ee mee? Pb oaks Yo Nate ee citi ow ee ele ah cas wie 283 
ENCRIOUA BG 6.6/0 aes ce aac Bet ac UCR oe ae Hd cl RE ei ee 283 
“TNE RGLNSR RANG IB cs cus Bie Geo USE acc eae ERRORS Otel oe Ta Rea ee Cn re eo 284 
(PIRSA OCIS. ig as snes Stan OO Dh ae Ae PR On ee 284 
Eager eer eee eee esate Pe See RTM Sh sie? Pe eaa fle. soo eg ene 285 
IGUSSAAM OREN Ae 555.6 onc lao! BS can | SAE ERG OSC eee ENC gem fe ee naa 285 
JONNEIPEIGED 0 ct cig eck cranky 8 Ate ero leeeeeste Giotto NRE SER fe tn ar a 285 
MLGMTES ER 6 ahs toc tle a lcs Gros SERRE Scr dorcel oli te Pa gen a 287 
CSBHROOOEIBR. AMG Hk vein Bac chek trap atc Caer Pee aac NC ar ee 287 
| PEACNEL ME SATHALSL UPA HED Onc, Ber Antares 1B Clo CLE SOSORE AE gene a ee et ee 287 
TBAT OHO 5 6 6.6.0 ab. Glebe, avceore bee are Chaat a Eon Cec eeME enh Ne rie ee 288 
{ES SSSA EYES OI STCTT ESI, is Bier OE ae HR Use eA eB Rg Ae 288 
The Periodicity in the Multiplication of the Organisms of the Plankton... 291-311 
Comparison of Plankton Pulses and Lunar Cycle (Table)............. 296-299 
Gusecus Contents of Pond Water (Table)... .. 1.2.0... ¢ 625-2 e eee ee 306 
Relation of Pulses of Chlorophyll-bearing Organisms to Lunar Cycle 
le ale emer mere eerie Se Ce awe tute decade) ete a lald Yards ois 308 
Gesell iConsideraiions on SeasonaliChanges.........2.6..202-- 08.0008 312 
AKemVetsUcHavetsblamc@Olenr. tees seins fee a bncee emcee sec Sees 312 
Organisms per Cubic Meter in Plankton of Illinois River in 1898 (Table)... 314-340 
ENT ELEC SEE UTERS Tie 9 Sat cen cabal ie ei ge My ea 0 341-354 
Peres teed AOA bes eagle Ps toms hee cise ec Slee oe Me Sew whe So 355 
DitoramsromocasonaleMiscrbttion y+. ser es cee ecie ole ae eee k oe 356-360 
BiaterraeamamANcddencdasenmacrcs< sk ascte cnc ce emesis oes eed meade 361 
