165 
than usual—for example, than those of Auurea (Table I.). This 
irregularity is somewhat more pronounced in the separated records 
of the type and variety (Table I.) than in their combined statistics. 
This fact that their combined curve of occurrence is more regular 
than their separated curves constitutes, to my mind, evidence that 
we are dealing only with one genetic cycle, and that the variety does 
not belong to a fully separated genetic series. 
The following table gives the data of pulses and temperatures in 
the several years. © 
PULSES OF BRACHIONUS ANGULARIS INCLUDING VAR. BIDENS. 
Weare Datees| hemp.) INO: Date | Temp.| No. Date |Temp.| No: 
| 
| 
282 | | Se |e ey Geer ay ee ae Le ee 
a lcemnt taeee ls |e oot 399 098) July 23)) 80°) \100,826 
Pe9G May. 25 | 70° | 67;600'| June 17-) 76° | 60;800'| July 10 | go° | 51,200 
DS) BHO | | Sieh 2400) 
1897 June 28| 75° | 75,000 | July 21 83° | 70,400 
1898 | June 7| 78° | 4,800 | June 28| 78° [544,000 | July 19| 84° |335,600 
Av’e | | 36,200 269,776 103,924 
Year| Date |Temp.| No. Date |Temp.! No. Date |Temp.| No. 
1894 | ———— | ——— | ——— | Sept.17] 73° L292 | ———S= | —— | 
Pe ea este ata) ECO m585 090) Ane 29) 80° 105,735 | ———= || ————_ | 
HeIGn Adon —S5) 85° |) 20800") Ade: 21) 79° | 29,600 | Sept. 16) 71° 5,051 
Heo 7) Aue. 31 180° 1988000 | Sept. 14)| 83° |368,,800)|-Oct. S| 71° | 18,400 
1398 | Aue. 16: 77° (853,600 |Sept. 6] 79° |163,200 | Oct. 25); 48° | 11,500 
“— 27| 73° |494,400 
ae i Ti eeerero: 195,834 Peel iaiese 
It will be noted that all the pulses with one exception lie above 
70°, averaging in fact 78.25°, indicating an optimum temperature 
