162 



" Supplementary Note on the proposed Remedies for the Era- 

 dication of the Vine-Malady." Received June 1, 1854. 



1st. I will take the annual production of wines in the Port-wine 

 districts of the Alto-Douro at 80,000 pipes instead of 90,000, and 

 the number of vines to be treated as diseased at 80,000,000. 



2nd. The value of freehold land in that district, for the growth of 

 1000 vines, or one pipe of wine, may be estimated at 507., yielding 

 an interest or rental of 31. per annum. 



3rd. The total freehold value of the vineyards in those districts 

 may be estimated at 4,000,0007. sterling, giving an annual revenue 

 of 240,0007. 



4th. In the event of the disease not being checked in its progress, 

 and the grapes being destroyed this year in the Alto-Douro, a mini- 

 mum loss of 240,000/, will be sustained, and should the vines perish, 

 the loss may be 4,000,0007. 



5th. Portugal is said to produce annually 1,000,000 pipes of 

 wine of all sorts and qualities, but I will estimate the total produc- 

 tion at 800,000 pipes, and the total number of vines in the country 

 at 800,000,000. 



If Flour of Sulphur be used, the leaves, branches and shoots are 

 first moistened as equally as possible with a syringe ; then the 

 whole is dusted with sulphur, which adheres to the moistened 

 surface. 



This operation would have to be repeated thrice, and would con- 

 sume two ounces of sulphur for every vine, in each of the operations, 

 making a total of 480,000,000 ounces, or about 13,392 tons for the 

 treatment of the 80,000,000 vines in the Alto-Douro, and 133,920 

 tons for the vines of the whole country. 



Sulphur would not cost less than 107. per ton, delivered in the 

 centre of the Alto-Douro districts, or in any other part of the inte- 

 rior of Portugal. The expense of sulphur required for the Douro 

 would be 133,9207., and for the whole country 1,339,2007. 



One man could moisten one vine in one minute, and another man 

 could dust it with sulphur in the same time, so that two men could 

 perform the complete operation on about 700 vines daily, at a cost 



