58 Selim Lemström. 



wet grass on the g'lowing torches, but, in most cases, tliis measnre will be 

 iinnecessaiy. Tlie woikmen who liglit the torches and watch their bixrning, 

 will herein have a suitable occupation until an hour before sunrise. 



According to our expérience, it is very seldom that protection against 

 frost is required oftener than once in the summer, for each kind of cereal, 

 and if we take the average of several years e. g. 10, this number will fall to 

 3, at most, 4 times, a decennary. 



If we estimate the cost for 10 hectares, we shall get the following: 



1,100 torches at 3 p. = 33 Fm. 

 4 men at 1 m 50 p. = „ 

 Petroleum = 1 „ 



= 40 Fm. 



The harvest of 10 hectares can be estimated at 2,400 Fm., thus the cost 

 of protecting it once will be about 



17 per thousand 



Assuming the protective measures must be taken 4 times a decennary, 

 the average cost for ten years Avill be 



6,8 per thousand a year. 



These protective measures will certainly be somewhat dearer on smaller areas, 

 but if home-made, the torches will be cheaper, so that in this case, the cost 

 need not be greater than the above calculation. 



The torches sJmild he lighted shortly after sunset dnring the months of 

 June and Jnly, but in May, August and the beginning of September, they 

 need not be lighted till after midnight, unless the température bas' fallen below 

 " earlier. 



In every case one must be guided by circumstances not to precipitate, nor 

 to omit until too late, the necessary précautions. It may certainly be taken 

 for granted that thèse protective meesures against a threatening frost are not 

 altogether in ^'ain, even if the frosts does not prove really destructive. If the 

 vegetation bas not been killed, it would have suffered much from the low tem- 

 pérature, and the raising of this will certainly be welcome i. e. it will resuit 

 in a fuller harvest. 



