192 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



The atmospheric pressure was within a moderate range, though 

 somewhat erratic in course. From 29*70 inches on the 1st, it 

 fell to 29*00 inches on the 3rd, rising again to 29*50 on the 

 5th, while on the 6th it was again down to 29'00 inches — the 

 only occasions during the month when that point was touched. 

 The rise was steady, but only on one occasion did the pressure 

 reach 30*00 inches, this occurring on the 25th. A steady decline 

 followed, and on the 30th the barometer indicated 29*40 inches. 



For the third year in succession the rainfall for this month 

 was low, the amount registered being 2*30 inches, and there 

 were 18 dry days. In the corresponding months of 1906 and 

 1905 the rainfall was 1*21, with 19 dry days, and 1*79 inches, 

 with 15 dry days, respectively. 



In regard to the temperature, while the average maximum 

 (52°) was 2° lower than that of April, 1906, the absence of 

 frost accounts for the higher average minimum, which was 39°, 

 or 4° above that of the previous April. Though the freezing- 

 point was approached on several occasions, only on one morning 

 (the 18th) was frost registered, and that only to the extent of 

 2° — a somewhat remarkable record for April. 



The move which vegetation had made in the latter part of 

 March continued vigorously during the first week, but the cold 

 easterly winds and lack of moist, genial conditions considerably 

 retarded its development during the month. Those trees which 

 naturally leaf early, and which had made some progress, were 

 severely checked by the touch of frost on the 18th, the young- 

 shoots and leaves of Chestnuts and Sycamores, as well as the 

 flowers of Rhododendrons — R. Nobleanum, R. Jacksoni, and R. 

 prcecocc — being badly browned. The effects of the frost were not 

 so apparent on Lilacs, Thorns, Spira?as, but all w r ere retarded. 

 The frost, however, did not harm the early hardy flowers, such 

 as the Narcissi and their spring congeners, and the display of 

 Daffodils was fine during the month. Field crops were planted 

 under satisfactory conditions generally, and grass lands were in 

 excellent order for the period of the year. 



May. — Opening with a cold, dull, wet day, the weather until 

 the 13th was changeable, rain and sunshine alternating, with 

 perhaps more of the former than of the latter. A severe gale of 

 wind was experienced on the 2nd, while on the 8th and 11th 



