220 















First record First maximum 
Year 
Date Temp. Date Temp. No. 
TOE tne spot eee eee a | iis CO) 83° 2,592 
PROG el oa EA tere SS || nie 6 80° 330,932 
TSO Gf ee cone eee aaitenect 4 Sete yeaa May 25 102 July 28 80° 20,000 
LiSO78 sine AEA We ee June 28 75° | July 21 34° 80,000 
TS9Ss ce, Lee, Sa ee June 21 77° | July 26 89° 99 600 
Second maximum Last record 
Year 
Date Temp. No Date Temp. 
1S OAR Me ieee ras tick: oe == Sees Sepi yal 72° 
NES OSer eae Met ahs fie diosa ia eranenens | Aug. 21 Sie 3 Ode | Octa 22 6305 
SD Ope were Ae soscctiot cheese Saete womse ee | Aug. 15 81° 77,600 | Sept. 16 qe 
Roe 7 PR m Retr ire Maer enrte Ar eats oR SeH ic | Aug. 17 ee 79,200 | Sept. 14 (ee 
RS OS Ne weh aie bio ee ee cve, cosy saa eevee Aug. 16 he No 2224000) Nowa sa 45° 





Bacillariacee, and Chlorophycee in the period in question in 1898 
are (PI. II.) July 19, August 9, August 30, and September 27. The 
apices of the Pedalion pulses are July 26, August 16, and September 
27, the last coinciding with the pulse of chlorophyll-bearing organ- 
isms. In 1897, the intercalation of the two pulses is apparent, and 
in 1896, two out of three pulses are intercalated and a third is 
coincident. As will be seen in Table I., these pulses of 1898 are 
approximately coincident in many cases with those of other roti- 
fers—Syncheta, Polyarthra, Triarthra, and Brachwonus. The sig- 
nificance of this intercalation lies probably in the food relations of 
the two groups of organisms. 
Females with a single egg attached to the body have been noted 
at the times of the maxima of the pulses, or immediately thereafter, 

Fit 4 

