220 
First record First maximum 
Year 
Date Temp. Date Temp. No. 
US OA a Ae tae eke tone enact —— —— | June 29 Son 232 
[BOG Se ane ene he ae ee Sly ato 80° 330,932 
NS OOo s areseod tess 2 Sai ehaths tacts May’ (25 Oe July 28 80° 20,000 
DROME Eats testers ake O eceleNenee June 28 fo ol Sealy 21 84° 80,000 
URORME hee coon, ae See June 21 77° | July 26 89° 99 ,600 
Second maximum Last record 
Year 
Date Temp. No. Date Temp. 
CY asa hey CFs CY ar ces eae a as <= ast Sepianr 72° 
SOS earnest are a ea aems Reaevege rea Aug. 21 81° SAG. |) Oree, 2 63° 
(NSO) Sab eae ea SM Ree | Aug. 15 ue 77,600 | Sept. 16 Ale 
USO mers ecm Stieee. ety ReeteG ieee Aug. 17 192 79,200 | Sept. 14 (ie? 
NS OS Re cions utara: aueles orsres soho Aug. 16 lis 22,400 | Nov. 1 45° 
Bacillariacee, and Chlorophycee in the period in question in 1898 
are (Pl. 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 Brachionus. 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, 
