222 
Linsser’s second study is based upon a much larger mass of pheno- 
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 mimimum of the year occurs if that mini- 
mum is above 0° C.; these are the limiting dates between which the 
sununation 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 in centigrade degrees. 
| Annual , 
Station. Initial | Final | DoSitive | set's 
tempera-| zones. 
= | tures. 
oc: 
Ressam': £0500: S5,! oJ) YOR oe a kee oral ein ane, | Jan. 15| Dec. 31] 5,226| A 
Let ina: ys ae he ede hae re See oS ge Lata Smee 5) a ee Jane dielaadomee 4, 797 B 
\Sir tga ee ae ae Se, Sa he nee ee | Jan. 1 |....do.| 4,669) A 
1D (oh ab Re Rat ee Roe Aho eM OTL 3 oes ge | Janey |----do. nd 4,251 A 
Gide berg ee Ree See oo ge ee anes a DERE Ue as Sie ae | Jan. 14) see doess 8, 933 A 
FAT ee Ue hn 2 Ye we a a ee cae Hie | Jan. 13 |----40--- 3,929] A 
IN ATU ee 2 See eee. on emer. Oise Dees ae emer. eee en ae |....do j28| ee doz 3, 865 | A 
Giionty Nee vO Oe ae igh ene renee ae Chay eR | Jan. 12 lc dot], 285815 Ieean 
RSCHiin Ci Rss coke ee eee Pee ye oes ee ee ee ee | Mar. 2]| Dec. 8 Bie) || 183 
RVLeTi Tapia: ewe WR RES een Peed ee sian et i oe | Feb. 8| Dec. 18| 3,%57| B 
Osterid She tao War oe RG Bree ie A ce eee Jan. 14| Dee. 31] 3,787] A 
IBRUSSe 1S Say eee eet teen Lie et a yay 3 a else oe eee | Jan. 16 |_...do--- 8,687 | A 
lepeeVeqb Vey as aehe A Sy Sree eee DAO DUT ERRORS tog eat RMMilR Yee a Re Feb. 16 | Dec. 16 3,582 B 
FS) EIU El Gz) 00 piled ers Me receipe @ a tg (ap A NEY Se Me oe Jan. 20 | Dec. 31 3,520} A 
IB TUNIS WAC kt ee sere Ss fects cee | Ten eee eal oer eee et Feb. 8 |..-do_..| 3,483 }) A 
Nareptas ase ok 2 he eae oe ons hs a le oe re | Mar. 27 | Nov. 12 Ber {ele 183 
Sitaviclope tee Jak Parse ee kN PRO s eee oe lene ee Paty eae | Jan. 20 | Dec. 31 Baa AN 
Mian Chine srs Bell gh sk eed Le, ene Oe a ee ' Feb. 14| Dec. 16! 3,125| A 
Tin pin genes eh eh eee NS ae ee eee ee ON Feb..9| Dec. 1] 3,12] A 
DS bebtim sets ee eS ee Mee ee ak Se nr ee et ee oe ae a eee Feb. 18 | Dec. 18 | 3, 115 A 
Wet semet iweb in sete Se S456 Jy ean AEE See Ue Gea ena Mar. 16 | Nov. 21 3, 085 B 
GREW YA 0} 0b if) A Se RS rs ene Pe does ee nk SC | Feb. 28! Dec. 16 | 3,018 | A 
Gorlitzeet? Verto Sa i) Sed Be eee les Ne oF eee | Feb. 19 | Dec. 6| 2,975| A 
Breslait =) 20 se oa eee CoM ee ee eel he ne ee eee | Mar. 2 |----do --- 2, 953 B 
OTe one a: Nain s fae OES Epes Se re eee es 1 ta eS |; Apr. 1 | Nov. 138 | 2, 807 A 
WE OSCO Wied oaks cee at ee sat Sel yee oe eg ee ee Apr. 4/ Nov. 4 | 2,631 A 
15 1s ee er cel ne ne REMERON MCT Pt, Mar.26|Nov.22) 2,574) A 
@iris Giermiay sees oe re We eet ce ee ee do...|Nov.11| 2,389] A 
1 oe err Ve ne UR a aie cer DA ait ee oe Apr. 8 | Nov.13| 2,303] A 
StvPetersbure. so eb eee. eos te ee eee ee ee Apr. 8} Noy. 9 2, 20¢ A 
CO 7 cl Koe epee eseaaey er eee ae pega TEEN cher pai Mn ytd Pia ge NIE | Apr. 19 | Oct. a) 1,898 | A 
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 development of the peren- 
