No. I PERIODS RELATED TO 273 MONTHS—ABBOT 15 
curve C, which is my synthesis multiplied by %o plus 56.8°. It is plain 
that the principal features and even most details of the smoothed 
Soergel curve are closely duplicated in my curve C. As Griinhagen 
used 6 periods, and I used but 4, the scale difference, 10 to 7, may be 
for lack of the others. 
I do not fully understand how Soergel derived the time scale for 
these very ancient events. Doubtless he used several disciplines, in- 
cluding paleontology and stratigraphy. It is extraordinary how closely 
my exact time scale fits with his time scale, which must have been 
built up from rather loosely timed data. 
4, MAGNETIC AND ELECTRICAL RELATIONS TO THE PERIOD 
OF 273 MONTHS 
Nearly 50 years ago Dr. G. E. Hale discovered magnetism in sun- 
spots. When this phenomenon had been followed long enough, the 
well-known remarkable reversal of polarities at intervals of double 
the sunspot period of 11% years was found. So the 273-month period 
is surely a magnetic period in the sun. 
When, about 1935, the ionosphere became systematically observed, 
the fluctuation of these electrical phenomena proved to be closely 
associated with sunspot frequency. But later I discovered that iono- 
spheric changes were also associated with the variations of measures 
of the solar constant. I will merely refer here to publications on this 
relationship.® 
5. THE HUMAN PULSE RATE 
In a former publication 1° I mentioned that my friend Dr. F. P. 
Marshall had kept a record of her pulse rate for three years, which 
indicated a regular period of 212 days and submultiples thereof. The 
observations were made every day before rising, and form a continu- 
ous record for 1,095 days of basal pulse rates. 
Dr. Marshall has kindly permitted me to use this evidence, which is 
unpublished. It shows clearly a period of 212 days and six periods, 
aliquot parts thereof (fig. 7), and others which I have not investigated. 
Dr. Marshall was familiar with my first studies on the solar constant 
of radiation, about 1935. She followed much the same course with 
the pulse observations. However, as the 15-year record of solar- 
® Smithsonian Misc. Coll., vol. 107, No. 4, pp. 24-26, 1947; ibid., vol. 122, No. 4, 
Pp. Q-II, 1953. 
10 Periodic solar variation, Smithsonian Misc. Coll., vol. 128, No. 4, pp. 3, 6, 
1955. 
