440 Dr. F. F. Blackman and Miss G. L. C. Matthaei, [Apr. 11, 
11.8 a second cloud came up, and the reading was ended, having consisted in 
all of 32 minutes of brilliant sunshine. The assimilation per hour with 0°28 
sunlight was 0°0116 for 29°-4 C., distinctly less than 0°0147, the maximum 
\ al 
300 CBC 
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Guid beto0g vod 29D suwrag iw Ne ul Je 
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which the temperature should allow. The metal screen was then removed, 
and a reading in full sunshine obtained, which gave the value of 00141 at 
29°-6, which is just the value we should expect after three hours’ high 
assimilation. 
