122 JOHN BERRY HAYCRAFT ON 
of the year; and that the conception numbers, when analysed, give just such a 
curve with a maximum at a corresponding phase, then the two correspond. 
They are due to the same cause, or one is the result of the other, In this case 
the conception curve would be the result of the temperature, not the tempera- 
ture the result of the conceptions. 
If, however, the maximum of one falls over the minimum of the other, there 
is certainly no direct relation, 
On making such an analysis * it is seen that the temperature curve gives a 
well-marked primary wave. 
If the time of one year be divided into 360 parts or fa ees, then the maxi- 
mum of this primary wave falls, at 185°, a little over the half year. The height 
or value of this curve may be represented by 10 units (see Mathematical Chart), 
The secondary curve—namely, that one whose maximum recurs every six 
months—is well marked, but of not so great a value as the former. It may be 
represented by the number 2°3 as its value, with the maximum at + 55°. 
There are other curves of temperature which result from this analysis 
(Mathematical Chart) ; they are of shorter wave length, but their nature is not 
known—perhaps they result from errors of observation. Their value is small, 
and they may be discarded from this question. On making a similar analysis 
of the conception data one finds a primary wave with maximum at +183", and 
with an altitude of 162°23 units, It is seen that the primary waves of the two 
curves correspond ; the one—temperature—having its maximum at +185°, and 
the other—conception—at 183°. There is, then, not a difference of 1 per cent. 
between them, and for this we shall account hereafter. The two then 
undoubtedly correspond. The secondary conception curve has an altitude of 
81:23, and the maximum fall at 53°. 
It will be remembered that the corresponding wave of temperature was at 
55°. These two again undoubtedly correspond, and the dependence is made 
yet more apparent when we see that the primary and secondary conception 
waves were just 2° behind (in point of time) the corresponding temperature ones. 
There will also be seen other conception curves of yet shorter wave length 
on reference to Table. 
Temperature, Conception. 
Maximum at Altitude. Maximum at Altitude. 
No.1 = + 185° 10 + 183° 162:23 
No.2 = +. 55° 2°3 + 55° 81:23 
Wo. Serato 0°0 — §2° 90 
No 4. 27-0" 1:0 — 37° 33°4 
No, 5 = + 225° 0:0 + 112° 17:0 
Nos, 1-5 are primary, secondary, tertiary, &c., waves of temperature and conception, 
by FourtEr’s Harmonic Analysis. (See Mathematical Chart for details.) 
* For a complete account of this method consult THomson and Tarr’s “ Natural Philosophy.” 
