285 



((•iii|H'r;i(iii(' ;it thai dalo, is r()iH|)iitod by llu' saiue process as 

 with the following results for the years 1884 and 1885 : 



hefori 



The mean values here given agree well with those of the j^revioiis 

 years, but the individual numbers have such a wide range that w^e 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 : 



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 



