576 BRITTON: VEGETATION OF THE 
a more abundant moisture supply as well as a firmer foothold. 
Doubtless many of the seeds were blown into the furrows. An- 
nual plants must usually mature before the hot days of July and 
August or they perish without perpetuating the species. 
No records were made of the temperature of the soil or of 
the atmosphere near the soil, but unquestionably both would be 
several degrees higher near the surface than where the soil is 
covered with turf, or where the soil is of a different character. 
The rainfall on these areas is probably not very different from 
the official record of the Weather Bureau at New Haven. The 
record of the rainfall as well as the temperature by months for the 
two years during which these studies were made is here given: 
PRECIPITATION 
. Igor 1902 
January, 1,38 inches. 1.83 inches, 
February, to Gelade 3.55 
March, 5.60 $6 BOT te 
April, 9.03 * 3.40 * 
May, 6.38 * 1.68. © 
June, 25 CS Oe ee 
July, 4.40 * 3.26 * 
August, 6.92 * 2.14 *€ 
September, 5.90. @ 54° * 
October, 295: ** 64% 
November, ¥.6y 26 Ny 4: Bead 
December, 5 tt 6.49 ‘* 
Total, 52.61 inches. 44.33 inches. 
TEMPERATURE 
Igor 1902 
Mean Maximum Minimum Mean Maximum Minimum 
January, 28 49 ca 27 49 6 
February, 24 41 8 27 50 Il 
March, 36 52 9 42 65 22 
April, 47 69 35 47 80 32 
May, 55 80 39 57 85 36 
June, 68 94 47 64 89 47 
July, 74 97 53 69 90 53 
August, 72 86 56 68 87 52 
September, 64 87 41 63 84 45 
October, 53 76 31 53 74 31 
November, 37 60 12 46 67 26 
December, 31 59 5 28 53 ee 
49 97 —I 49 90 ee 
