RURAL ECOXOMICS 



183I 



Table IV. — Data treated by the arithmetic and the algebraic methods 

 production of a vineyard in quintals per hectare. 



Table V. — Average earnings of metayers in Central Italy 

 per " man unit " per annum. 



Locality 



Authority 



No of 

 estates 

 studied 



Earning per "man unit" 

 per annum 



Maximum Minimum 



Tuscanv. 



Val d'Elsa . . 

 Val d'Arno . . 

 Pistoian Hills . 



( 1913 ■ 

 \ 1914 . 

 Umbria (Middle Tiber Valley) 

 Marches (Pesaro) 



Tuscanj- 



Umbria (S. Venanzio) 



Mazzini (i). . . . 

 Ltnari (2) . . . . 

 Bruttini (3) . . . 



guicciardtni (4) 



Fa IN A (5) . . 



BlXDOCCI (6) . 

 NiCOLETTI (7). 



14 

 51 

 21 



31 

 19 

 18 



9 



9 



52 



40 



Lite 

 310 

 479 

 525 

 641 

 642 

 539 

 639 

 605 

 771 

 480 



Lire 

 200 



139 

 177 

 356 

 360 

 320 

 123 

 142 

 131 

 51 



Lire 



282 

 256 

 283 

 485 

 489 

 396 

 336 

 348 

 407 

 160 



(i) Atti della Giunta per VInchiesta Agraria, Vol. Ill, No. i, p. 470. 



(2) UAgricoltura Italiana, 1902, No. 12. 



(3) Bollettino della Soeietd degli AgricoUori Italiani, Aug. 31, 1905. 



(4) Nuova Antologia, April 16, 1907. 



(5) Id. March 16, 1905. — According to this authority : i adult man = i man unit, 

 and I adult woman = ^/^q man unit. 



(6) "II guadagno del mezzadro nella media Valle del Tevere ". Perugia, 191 6. 



(7) Bollettino deU'emigrazione, 1909, No. 20. 



in Italy (1909) proved satisfactory because the areas involved were large, 

 but returns collected on the old method of small areas are open to 

 criticism. 



The homogeneity of data is a fair indication of their reliability and con- 

 sequently has a marked influence on the correctess of the conchisions drawn 

 from them. As an illustration of the necessity of a i^reliminary enquiry 

 into the homogeneity of data before using them as terms of comparison, the 



