285 
temperature at that date, is computed by the same process as before, 
with the following results for the years 1884 and 1885: 
. 
Daily mean tem- Daily maximum 
Pitat. | ae se ane ponent. 5 
| Mean. | Range. Mean. Range. 
| oC: | Kae Oy oF o¢. 
Inilac-ve2= 2 >. ee ees Pe est ee Arnie ee seenccencs| EL I ais (eae es 14.7 | 4.7..20.8 
(Ep ADO aes (SS ee ee 9.6) 6.3..13.7 15.3 | 10.9.-22.3 
VBS) Bae ae a 10.1) 5.8_.14.3 | 15.9 |  9.7--22.7 
CE ek 5 See Ce eee Oe eae aS 10.3 | 6.0_.15.18% 15.7 | 11.9_-21.0 
The mean values here given agree well with those of the previous 
years, but the individual numbers have such a wide range that we can 
not conclude any simple relation between the leafing and the mean 
temperatures. 
The relation between the leafing and the sums of temperatures is 
found, as before, by assuming the end of the last period of frost as 
the commencement of vegetation; for these years this corresponds 
with the last few days of January. The useful temperatures are 
considered to be those above 0° C., and Angot has computed both the 
sums of the mean daily temperatures and also the sums of the 
maxima alone with the following results: 
Sums of daily | Sums of daily 
means. maxima. 
Plant. | 
1884. | 1885. | 1884. | 1885. 
Cet INGE OOF | 2G 
IRs 255 2 oye Oe ef ee ee ee eee ee eee Oe ee Se 428 414 686 666 
WHOS Tn eta at oe = Se eee aaa ee ee oe tas seen Sees seems es 568 575 | 924 | 925 
TES: Chee ne See ee Se ree ne eee ences | 609 587 | 988 | 944 
OM Rs sees se eet eee ee I EE a ae ie eee ce | 709 717 | 1,149 | 1,146 
The reliability of these sums is, as before, determined by examin- 
ing the departures, although not according to the strict rules of the 
law of probabilities of errors, but sufficiently so to show that the 
uncertainties of each of these figures is larger than the differences 
for successive years. The average of the two years, 1884 and 1885, 
are considerably higher than those for the previous four years. 
The flowering of the lilac, chestnut, elder, and linden is again inves- 
tigated by using the observations at some 1,200 stations or less. The 
reduction for altitude is as before. The mean daily temperatures 
