RITRAI, ECONOMICS 



i82q 



Tabi,e I. — Production of dry fodder per hectare in the Province of Rome. 



District 



Production of dry fodder per hectare 



From crop 

 returns 



I Weight of 

 Calculated from livestock 

 Uve stock returns P^r l^ectare 



I 

 2 



3 

 4 

 5 

 6 



7 

 8 



9 

 lo 

 II 



12 



13-16 



17 



i8 



19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 

 27 



Volscian Hills 



I<ake of Bolsena 



Bognorea Hills 



Orte and Civitacastellana . 



Soracte 



Viterbo 



Cimini 



Maremme (inland) . . . . 



Vetralla 



Maremme (coast) 



Civitavecchia 



I<ake of Bracciano . . . . 

 Agro Romano (3 districts) 

 Anzio and Nettuno . . . . 

 Upper Valley of the Anio 

 Valley of the Tiber. . . . 



Prenestina • •• 



Alban Hills ....... 



Simbruini Hills 



Velletri and San Paliano , 



Val Sacco 



I,epini Hills 



Ausoni Hills 



Pontine Marshes 



Quintals 



Quintals 



Quintals 



due not so much to the way the returns are collected as to incidental causes. 

 In the series of figures dealing with the production of a vineyard during 

 the earh^ years of its life (series A , Table IV), there is some anomaly in the 

 figures for the seventh to the tenth years. B}^ using Wittstein's method ot 

 determining the means of 3 terms, the series B is obtained which is far more 

 regular. Or by applying the algebraic method, i. e. inter])olating a parabola 

 of the second order according to the method of the least squares, the series 

 C is obtained. The geometric or graphic method also gives good results. 

 This method consists in re])resenting the actual figures by a Cartesian dia- 

 gram and in interpolating in it a cvirve which ai)proaches the same series. 



