258 
take the mean values for the twenty days previous to the date of 
maturity we obtain the data in the second, third, and fourth columns, 
and we notice that although in the warmer seasons there may be a 
great variety in the value of the crop, yet in the cold seasons, 1877 
and 1879, when the mean temperatures fell below the limit (12.5°) 
required for ripening, the crop was very poor or failed altogether. 
Tf now the total radiation from sun and sky is computed according 
to Marié-Davy’s method for the period between leafing and flowering 
and again from flowering to maturity we obtain the figures in the 
columns five, six,and seven. Here we see, as before, that the variation 
during the flowering period was of little importance, whereas that 
during the ripening period has a direct relation to the character of 
the wine crop, such that in general the larger the total radiation the 
better the crop, provided the temperature of the air has not fallen 
too low. 
Pure Dees 20 | Total pee uon by Goeneralicharactodat 
Pepe eA —— zs pies oe 
Calculated dates of | Mean | | Flow- | as 
ripening. daily pee | Total paoete Sain Juice. 
tem- | ,. AEM rain- ABs : | Sum. |— — Wine crop. 
| pera- | 4 fall | ripen- 7 . 
RD tion. ing. | Sugar.) Acid. 
ing. 
| ae ee E 
°C, |° Actin.| mm. |. actin. ° Actin.|° Actin. 
October %, 1873. -.-.---- | 16.1 30. 2 20.3 | 1,278 | 4,590 | 5,868 162 8.2 | Excellent. 
September 25, 1874- ---- 16.0 27.6 28.8 | 1,343 | 4,544 | 5,887 179 | 6.1 | Finest. 
September 21, 1875. ----| 17.4 40.6 | 5.9 | 1,306 | 4,322 | 5,728 181 | 5.4 | Good. 
October 7, 1876__-__---- 16.2 27.7 16.7 | 1,222 | 4,205) 5,427 174 | 6.8 
Octoberi2; 1877__ 2 == 11.9 30.4 8.2] 1,280] 4,603 | 5,883 186 8.7 | Very poor. 
October 2, 1878..-...... 13.3 25.5 23.8 | 1,288] 4,165 | 5,403 181 6.7 | Good. 
October 15, 1879-__--._-- 1D) 26.1 6.3] 1,355 | 4,033 | 5,388 154 9.5 | Very poor. 
September 29, 1880____- 1552 27.8 25.0 | 1,305) 3,966 | 5,301 188 6.4 | 
September 26, 1881_____ abs st 24.2 81.2 | 1,575 | 4,262) 5,887 180 | 6.1 | Excellent. 
Average Octo- | 
Der 2 ees pes 14.7 28.9 24.0 | 1,322 | 4,302 | 5,636 176 TA 
In general, Marié-Davy concludes that the number of grapes to the 
bunch and the number of bunches to the vine do not seem to have any 
clear relation to meteorological conditions, except in the case of spring 
frosts, which can destroy a crop. Besides the conditions as to pruning 
the vine and dressing the soil, the number of grapes that have set (on 
which principally depends the quantity of the crop that will be pro- 
duced) is a result primarily of the meteorological conditions during 
the previous year and of the state of preparation of the woody stock. 
On the contrary the final size of the grapes and the quality of the 
juice depends on the meteorological conditions of the crop year and 
those that accompany the flowering and succeed it up to the time of 
maturity. A final sum total of radiation is not sufficient; it is 
necessary to take account of its distribution with reference to the 
