STIMULANT, AROMATIC, NARCOTIC AND MEDICINAL PI,ANTS I785 



3) To obtain uniformity of crop l)y means of a suitable choice of 

 seed : 



4) To establish government institutes for the production and control 

 of tobacco seed. 



In 1904 experiments were begun at Imoski find artificial crosses were 

 made between Herzegovinian types (Stolatz and Drinovtzi) and Mace- 

 donian tobaccos (Kir and Giubek), the first crop from original seed being 

 used for parents. The following crosses were made : 



Drinovtzi X Giubek (iiubek x Drinovtzi 



Drinovtzi X Giubek Giubek X Drinovtzi 



Drinovtzi X Kir Giubek X vStolatz 



Stolatz X Giubek Kir X Drinovtzi 



Stolatz X Kir Kir X Stolatz. 



The resulting hybrids were grown in 1905, and the descendants of tha 

 cioss between Drinovtzi and Kir were much better than their parents. 

 These hybrids were again crossed with one of the parents, thus : 



Drinovtzi X Giubek2 Stolatz X Giubek^ 



Drinovtzi X Kir^ Stolatz X Kir^ 



After 1909 the trials were more and more improved by the use of 

 Angeloni's method. It had been proved that the distance between 

 the plants has a very great influence on their character and qualities, so 

 that the more the distance between the rows and between the plants in the 

 rows was reduced the more closely did the hybrids in the plantations ap- 

 proach the Macedonian type in character. 



After 1908 the American method of race improvement by artificial 

 self-fertilization was also practised on Giubek. 



The chief facts established by the Imoski and Sinj trials are as follows : 



When Herzegovinian tobacco is crossed with a Macedonian t^'pe the 

 hybrids in the first two generations almost equal the taller parent in height, 

 but in the later generations the height decreases, at first rapidly, then more 

 and more slowh^ ; the number of leaves behaves in the same way as the 

 height. The maximum length and breadth of the leaves, after the fir.st 

 cross, rapidly and constantly decrease, and ma}^ throw back to that of the 

 smaller of the parents ; the ratio, length : breadth, of the leaves increases 

 from the first and approaches, but never quite equals, the ratio of the Ma- 

 cedonian parent. 



When a Macedonian tobacco is crossed with a Herzegovinian type 

 the number of the leaves and the height of the hybrids decrease steadily 

 after the first generation ; the length and breadth of the leaves increase 

 normally ; the ratio, length : breadth, decreases from the beginning and 

 approaches, but never quite equals, that of the Herzegovinian parent. 



Similar regular gradations can be proved with regard to length of 

 internodes, number of flowers, the arrangement of the inflorescence, size 

 of angles of insertion and the strength of the leaf venation. 



