METEOROLOGY. GROWTH OF PLANTS. 483 



In the same place Tremois wheat is sown in the befrinning of 

 May, and the harvest takes place towards the 15th of Aiinfust, so 

 that it is 106 days on the ground under a mean temperature of 68" F., 

 (7208" F.) 



At Cincinnati the wheat sown in the end of February is harvest- 

 ed in the 2d week in July, say the 15th day, the crop is therefore 

 137 days on the ground under a mean temperature of between 60" and 

 6r F. (8288" F.) 



INTERTROPICAL REGION. 



Wheat sown at the end of February was reaped on the 25th of 

 July at Zimijaca, plain of Bogota, having been 147 days on the 

 ground, the mean temperature being between 58° and 59° F., 

 (8526° F.) 



At Quinchuqui the vegetation of wheat begins in February and 

 ends in the month of July, say, 181 days ; and I found the mean 

 temperature to be between 57° and 58° F. 



At Venezuela, according to M. Codazzi, wheat to ripen requires 

 92 days at Turmero, mean temperature between 75 2° and 76° F., 

 (6918° F. ;) 100 days at Truxillo, mean temperature 72.1° F., 

 (7210° F.) 



CULTIVATION OF BARLEY. 



Of the cereals, barley is that which succeeds in the most diversi- 

 fied climates. It comes to maturity under the burning heats of the 

 tropics ; and in regions where the mean and constant temperature 

 is scarcely 52° F., fields of barley of great beauty are still en- 

 countered. 



At Alsace (Bechelbronn) barley sown at the end of April was 

 harvested on the 1st of August. It had remained 92 days on the 

 ground, the mean temperature having been between 66° and 67° F., 

 (6118° F.) 



Winter barley sown on the 1st of November was cut on the 1st 

 of July. Reckoning the period of active vegetation from the 1st 

 of March, it was 122 days in coming to maturity, the mean temper- 

 ature having been between 58° and 59° F., (7076° F.) 



At Alais winter barley is harvested on the 18th of June. As- 

 suming that, as in the case of wheat, the 1st of February is the date 

 of commencing vegetation, it must have taken 137 days to come tc 

 maturity under a mean temperature between 55° and 56° F. 



In Egypt upon the banks of the Nile barley is sown in the end 

 of November, and the harvest takes place at the end of February, 

 at an interval therefore of 90 days, and the mean temperature of the 

 winter at Cairo is nearly 70° F., (6300° F.) 



At Kingston, North America, the barley is sown in the begin- 

 ning of May, and the crop is cut towards the beginning of August, 

 in about 92 davs, therefore, the mean temperature being between 

 66° to 67" F. 



At Cumbal under the line there is no fixed period for sowing 

 barley. It is generally put into the ground on the approach of th» 



