244 



TRANSACTIONS AND PROCEEDINGS OF 



[Sess. 



On Temperature and Vegetation in the Royal Botanic 

 Garden, Edinburgh, during December 1891. By PiOBERT 

 Lindsay, Curator of the Garden. 



The month of December was, for the most part, mild and 

 open, with a very heavy rainfall. The thermometer was at 

 or below the freezing point on eighteen mornings, the total 

 amount of frost registered being 83°, as against 121° for the 

 corresponding month of 1890. The lowest readings occurred 

 on the 15th, 24°; Iffth, 26° ; I7th, 23°; 18th, 24°; 22nd, 

 23°. The lowest day temperature was 34°, on the 11th, and 

 the highest 57°, on the 2nd. 



On the rock-garden the following plants came into flower 

 during the month, viz., Helleborus nigcr major, H. 2')y-rpuTascens, 

 var., and Primula infiata. The total number of alpine and 

 dwarf-growing herbaceous plants which have flowered on the 

 rock-garden during the year 1891 amounts to 1216, being 

 137 less than during 1890. The deficiency occurred chiefly 

 during the month of May, The number of species which 

 came into flower each month was as follows : — 



January, 6; February, 39; March, 40; April, 119; May, 

 260 ; June, 359 ; July, 252 ; August, 84 ; September, 41 ; 

 October, 13 ; November, 0; December, 3; Total, 1216. 



Readings of exposed Thermometer at the Rock-Garden of tlie 

 Koyal Rotanic Garden, Edinburgh, during December 1891. 



Date. 

 1st 

 2nd 

 3rd 

 4th 

 .5th 

 6th 

 7 th 

 8th 

 'Jth 



10th 



nth 



12th 



i:3th 



14th 

 15th 

 IGth 



Minimum. 



35"^ 

 29 

 30 

 42 

 39 

 37 

 34 

 29 

 40 

 33 

 29 

 27 

 28 

 30 

 24 

 26 



Date. 



17 th 

 18th 

 19 th 

 20th 



2l8t 



22nd 

 23rd 

 24 th 

 25th 

 26th 

 27 th 

 28th 

 29 th 

 30th 

 31.st 



Miiiiimini. 



23° 

 24 

 37 

 35 

 36 

 23 

 26 

 28 

 28 

 27 

 .33 

 30 

 34 

 33 

 32 



9 A.M. Maximum. 

 34° 36° 



35 

 42 

 42 

 40 

 27 

 33 

 34 

 29 

 39 

 36 

 33 

 37 

 36 

 35 



46 

 44 

 44 

 43 

 36 

 38 

 38 

 37 

 47 

 49 

 39 

 50 

 41 

 42 



