261 = 
or very bad; 2, small or bad; 3, passable or mediocre; 4, fairly good; 
5, good; 6, very good. . 
Dates when mean | 
temperature of 
| 
| General character of 
: 5 During the season. sugar crop in Pas 
air ther 4- 5 : 
| tee in SHadee® Dura- de Calais. 
tion gl su Pes 
Year. | eS ae best Sum of Sum of | 
| ises as) Salers mean mean | Total | | Den- 
| above below season. daily air daily rain- | nas Sue sity of 
[ Eo: IB} (Cf tempera-| radia- | fall. y- Y- | juice. 
| | ture. tion. | | | 
; pies Se | ae AG SIND Hea 
| Beau- 
| Weeks. eG ° Actin.| mm. | meé. 
Meee. ex, 5 ee. 2 | Mar. 23 | Oct. 12 29 BAO) |S 5292-22: 393 | 4 5 5.3 
Ct 3 | Mar. 16 | Oct. 19 31 3,389 8,968 264 5 3 4.6 
TUS (Ges WS Rei ee i ee re | Mar. 380 | Oct. 5 27 3, 172 | 7,900 313 6 3 4.2 
ASU Guerre Ee ee: | Mar. 23 | Oct. 19 30| 3,003) 8,589 299 1 3.9 
ier ae Re le a do .._| Sept. 21 26 2,786 | 7,326 | 344 4 6 5.5 
Its}(c} = oe i ae Aas GO) eas hOnee 24 2,791 | 6,552 347 | 5 3 4.7 
They it) ast SEES Se ea Arp Iss 20) |aan2dor == 22 2,359 5,815 | 278 | 1 3 4.4 
TSI) eA oe pe Mar. 2| Oct. 11 32 SeISo Meera 1OLle | C280) |e ese se) ee eet ee 
ISIE eee ie oo Apr. 6) Sept.28 25 2,520 G56 |), pe BLO! hem tae | eee La Se 
Average __... Mar. 26| Oct. 4 27; 2,915! 7,484| 306 | neAS Pen = 
The climatic data given in the above table as directly applicable to 
the seasons of growth of the beet root illustrate what should be given 
for any similar study of development of any crop. But it is com- 
monly the case that the dates of the various phenological epochs are 
not exactly given, and that we have to rely upon general tables of 
general climatic conditions month by month, such as are recom- 
mended by the International Meteorological Congress of Vienna and 
by that of Rome. Therefore, for the sake of comparison with other 
climates whose data are given on the so-called international forms, IT 
give in the following table a part of Pagnoul’s tables of average tem- 
perature Centigrade and rainfall in millimeters as observed at Arras: 
| Mean daily shade temperature. Total monthly rainfall. 
Year. SSS SSS — —| - 
| Apr. May.|June.| July./ Aug. |Sept.| Oct. | Apr. | May. June.| July. Aug. Sept. Oct. 
ae = jo —s = ae | 
Ey peeeee ts 8.6 | 11.0 | 16.7 | 19.17] 18.2 | 13.5 | 9.9 | 48.6 | 45.5 | 63.3 | 26.2| 40.3 33.5 | 56.1 
eye 5 oe Ss Ae OS Mea TGrOnle 20s Me) OF Maroy) TION 20h 7 s2a9 12557 | 6K0 | 34.2 | 92.3 | 47.2 
= 2 x | | - 
IG ee eee 9.6 | 14.7 | 16.7 | 17.4 | 19.1 | 16.6 | 9.0] 8.0 | 30.7 2.0 | 63.7 | 62.0) 74.5) 61.6 
VSG ee see 9.3 | 14.8 | 16.7 | 19.6 | 19.3 | 18.9 | 12.1 | 41.3 | 15.3 | 32.0 | 23.8 | 87.3 87.0 24.5 
ksi (fies es Oe | 8.8 | 11.3 NOM aS. |) dives || bead Sera 5.0 | 88.2 | 23.0 | 61.2 | 96.5 | 50.3 | 48.5 
TOYS ra. Se 16.3 | 14.2 | 17.2 | 18.0 | 18.6 | 14.9 | 10.6 | 53.7 | 88.4 | 60.6 | 46.7 | 86.6 42.9) 87.3 
G4!) oe = ee 7.6 | 10.6 | 15.9 | 15.5 | 17.6 | 15.1] 9.8 | 48.4 | 51.7 1138.6 (142.0 | 50.5 | 89:5 | 45.4 
| | 
The preceding study gives a first idea as to the relation between 
climate and the development of the leaves, the roots, and the sugar, 
and offers a first step toward determining how suitable for the beet- 
sugar industry any climate may be, and especially does it suggest to 
