126 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



Glasgow Spring Holiday was held, was of a most unpleasant 

 nature, the day being dull, cold, and rainy. On the morning 

 of the 19th, after a sharp frost, there was a dense fog, which 

 lasted for several hours. Colder weather prevailed during the 

 latter half of the month, many days being dull and raw, with 

 occasional showers of hail, while on the 28th there were heavy 

 showers of snow. 



In the early part of the month the atmospheric pressure was 

 high and fairly steady, and between the 1st and 15th it was 

 only four times slightly below 30' 00 inches. There were two 

 sharp falls on the 5th to 29' 60 and on the 13th to 29*80, on 

 which days the weather was dull and cloudy. The highest 

 reading of the barometer was 30'50 inches, on the 9th. After 

 the 15th the pressure never touched 30 '00 inches, while the 

 lowest reading was 29*00 inches, on the 29th. 



In regard to the temperature, the average maximum was 

 54 and the average minimum 35°. Though only a total of 

 12° of frost was registered on six days, the minimum ther- 

 mometer was frequently low, and it was at or below freezing 

 point (32° Fah.) on ten occasions, and at or below 35° on 

 nineteen mornings, consequently the average minimum tempera- 

 ture is low, and 1° lower, while the maximum is 3° higher, than 

 the respective figures for April, 1905. 



There were 19 dry days, and the rainfall only amounted to 

 1*21 inches, which is, as already indicated, much below the 

 average. In the corresponding month of 1905 the amount was 

 1*79 inches, with 15 dry days, whereas in April, 1904, there 

 were 4*64 inches and only 6 dry days. 



The sunny weather in the earlier part of the month had its 

 natural effect on vegetation, and those species of trees which 

 tend to start early into growth began bursting their buds, and 

 by the 15th there was a decided sheen of green in the wood- 

 lands. Amongst the many deciduous trees which bloomed well, 

 the Norway maple (Acer platanoides) was more strikingly 

 effective when in flower than usual. Those early and usually 

 effective hybrid rhododendrons, Rhododendron Jacksoni and R. 

 Eugenie, were also in full flower by the above date. However, 

 these, along with the acers, beeches, and chestnuts, were badly 

 browned by the sharp frost on the 19th. The colder weather of 

 the latter part of the month greatly checked the development of 



