170 CITRUS FRUITS AND THEIR CULTURE. 



nent, generally oblique in direction, one or two areas 

 smooth and plain. 



Rough Lemon. Ovoid or slightly tapering; small, 

 3-8 inch long x 1-4 inch wide x 3-16 inch thick, 7-16 inch 

 long x 3-16 inch wide x 3-16 inch thick ; frequently marked 

 with a prominent ridge along one edge, other lines small, 

 rather in inconspicuous, anastomosing. 



Sour Orange. Plano-convex or double-convex, pointed 

 or flattened and wedged toward the micropylar end, long 

 and narrow or slightly rounded; 11-16 inch long x 5-16 

 inch wide x 3-16 inch thick, 9-16 inch long x 1-4 inch wide 

 x 3-16 inch thick. When plano-convex, there is a large, 

 smooth area on the flattened side, the rounded side being 

 ridged with long, more or less parallel ridges, which unite 

 at the ends. 



The seeds used in propagation work should be se- 

 lected from healthy, vigorous trees, and small, immature 

 seed should be discarded. Careful selection in this matter 

 will do much toward procuring vigorous, well developed 

 stocks. 



Seeds may be separated from the fruit by cutting it 

 in halves and squeezing them out into a sieve. This 

 will allow the juice to run through and the seeds may be 

 washed from the pulp afterwards. The work can be read- 

 ily and cheaply performed by boys. Another method is 

 to place the fruit in barrels and allow it to rot, after which 

 the seed is washed free from the pulpy mass with running 

 water, using a sieve as before. 



If citrus seeds are allowed to become too dry^ they 

 do not germinate well and unless they are to be planted 

 immediately, they should be stratified in damp sand or 

 earth. The former, washed free from all impurities, is pref- 

 erable, as organic substances in the soil may contain 



