




105 
than usual—for example, than those of Anurea (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. 



















Date |Temp.| No. Date |Temp.| No. Date |Temp.| No. 
maa cae |e | Soe | ly 1S) 82812118 
|e uly, <6 | 81° 309,196 | July 23 80° 100, 826 
May 25| 70° | 67,600 | June17) 76° | 60,800 | July 10) 80° | 51,200 
Se Zon eo Oe senor400 
ume 2s 15°) 75.000) | July 21) “S32 "70,400 
Waime” 7.| 78° 4,800 | June 28| 78° [544,000 | July 19) 84° (335,600 
36,200 | 269,776 | 103,924 
Date |Temp.| No. Date |Temp.| No. Date |Temp.| No. 
—— | —— | —— | Sept.17| 73° 1,272 | ——— | —— | ——— 
reed aes 08 5856000) |eAnie 291) 80°) 1050 735) ee] 
Aug. 8] 85° | 20,800 | Aug. 21] 79° | 29,600 | Sept.16] 71° | 5,051 
Aug. 31 |- 80° |988,000 | Sept.14| 83° |368,800 | Oct. 5| 71° | 18,400 
amo aio aos 000) |oept.. O1) 792 |£63 200° | Oct. 25), 48° >) 11,500 
“— 27| 73° |494,400 
Av’g | l4g6., 872 | 195 ,834 (eeres! 11,650 









It will be noted that all the pulses with one exception lie above 
70°, averaging in fact 78.25°, indicating an optimum temperature 
