XVi FLORA ORCADENSIS. 
Mean Hours 
Mean Temperature. Sunshine. Mean Rainfall. 
1871-1905. 1880-1907. 1841-1907. 
JANDA Ess cce. (aw). A} tev nee ZONE) > ak ome 3°72 
February...... to it a ee DD'S. Seas 3°05 
Marchi virus: SS 6 Erne 101:b* cee 2°82 
ATI ree escieet LG Rae ate 93 154" eee 1°99 
IMG tas cone AGAR “Ryka LiSb. 25 1°81 
JUDE fie oroeoes i es ee eh ee 1603 ee 1:97 
GUOLYs eves tans DAA? post Bere 141°3> eee OT 
2X1 Fey 615) Cane Shee ODEO) ii sepa 121°8- * sure 301 
September...) 01 "v2.0, 105°8'" “Sie 3°09 
October ........ 7A TR 18! eee 4°43 
November..... Ce AEP naan: 20°) scan 3°97 
December ..... SF Pane: 20°S') ene 4°21 


Mean... 45°4 Total... 1184°5 Total... 36°65 
These statistics do not help us much, as_ the 
variations in temperature, rainfall, and sunshine in 
different altitudes in Perthshire itself is as great as 
between the north and south of Scotland. Neither 
in Orkney nor in Perth do plants in normal seasons 
suffer from drought. The rainfall is well distributed 
in both. April, May, and June are the driest months 
in Orkney, but even during that period there is no 
lack of moisture. Sunshine is, after water, temper- 
ature, and soil, the most important factor in plant 
life. Very few county floras have been written for 
the north of Scotland. This is why we have chosen 
the “Flora of Perthshire” as a model with which 
to make comparisons. It was edited by Professor 
James Trail, F.R.S., F.L.S., of Aberdeen, whose well- 
known abilities and position are a guarantee of the 
thoroughness and reliability of the work. 
