222 



Tjinsser's second study is based upon a much larger mass of i^lieno- 

 logical observations than that previously used by him, and, in fact, 

 more than has ever been used by any other investigator of this sub- 

 ject. The accompanying table gives for each of his stations the 

 initial and final dates when the normal mean daily temperature is 

 0° C, or the date when the minimum of the year occurs if that mini- 

 mum is above 0° C ; these are the limiting dates between which the 

 smmiiation of temperature is made according to Linsser's method. 

 The sums total of positive temperatures for the whole year are given 

 in the third column ni centigrade degrees. 



Initial 

 date. 



Final 

 date. 



Ajiniial 

 sums of 

 positive 

 tempera- 

 tures. 



Lins- 

 ser's 

 zones. 



Parma 



Venice 



Dijon 



Heidelberg . 



Paris 



Namur 



Ghent 



Kischineflf . 



Vienna 



Ostend 



Brussels 



Prague 



Swaflfham . . 

 Brunswick . 



Sarepta 



Stavelot 



Munich 



Tubingen. . . 



Stettin 



Kief 



Kreuzburg , 



Gorlitz 



Breslaii 



Orel 



Moscow 



Christiania . . . 

 Abo 



St. Petersburj 

 Carlo 



Jan. 15 



Jan. 17 



Jan. 11 



Jan. 5 



Jan. 14 



Jan. 13 



...do... 



Jan. 12 



Mar. 2 



Feb. 8 



Jan. 14 



Jan. 16 



Feb. 16 



j Jan. 20 



Feb. 8 



I Mar. 27 



Jan. 20 



Feb. 14 



Feb. 9 



' Feb. 18 



Mar. 16 



I Feb. 28 



! Feb. 19 



i Mar. 2 



I Apr. 1 



Apr. 4 



Mar. 26 



- .do... 



Dec. 31 

 ...do.. 

 ...do.. 

 ...do.. 

 ...do.. 

 ...do.. 



Apr. 3 

 Apr. 8 

 Apr. 19 



....do... 

 Dec. 8 

 Dec. 18 

 Dec. 31 

 ....do... 

 Dec. 16 

 Dec. 31 

 ...do... 

 Nov. 12 

 Dec. 31 

 Dec. 16 

 Dec. 1 

 Dec. 18 

 Nov. 21 

 Dec. 16 

 Dec. 6 

 ....do... 

 Nov. 13 

 Nov. 4 

 Nov. 22 

 Nov. 11 

 Nov. 13 

 Nov. 9 

 Oct. 30 



"C. 



5,226 



4,797 



4,669 



4,251 



8,933 



3,929 



3,865- 



3,815 



3,799 



3,757 



3,737 



3,687 



3,582 



3,520 



3,433 



3,271 



3,151 



3, 125 



3, 125 



3,115 



3,035 



3,018 



2,975 



2,953 



2,807 



2,631 



2,574 



2,389 



2,303 



2,253 



1,898 



A plant has access to water by two methods — through its roots it 

 absorbs the water in the soil, whereas its leaves come in contact 

 with the vapor and the rain in the atmosphere; but Linsser con- 

 siders that the relation of the plant to the water in the soil is the 

 important feature that decides as to the develojjment of the peren- 



