60 BULLETIN 815, U. S. DEPARTMElsrT OF AGRICULTURE. 



large crops, averaging only slightly below the trees of the Lisbon 

 strain in the investigational plat. This combination of high pro- 

 duction and heavy individual fruits which grow very rapidly and 



T'p a^^A/ .s77P^//v...- -^<^<^/' i^^HJ^HHHH^^^HHHHHHHHi 



// ^^/yz sTAi4/A/. ^'^^'^I^H^HHHBHHIHBHHHHIHBHHHH 



Fig. 9.— Diagram showing the average weight per fruit of the Lisbon lemon of the Green and Tree-Ripe 

 grades borne by the trees of the various strains occurring in the investigational performance-record plat. 

 These weights are expressed in ounces and are based on data for the 4-year period from July, 1913, to June, 

 1917, inclusive, except as noted in Table I. 



are thick skinned is probably due, in part at least, to the excessively 

 vigorous and rapid growth of the trees of this strain. 



Figure 10 shows the average seed content of the fruits of the 

 various strains in the Lisbon investigational plat. The fruits of 



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/iP Ay(pyy,^:5'y /^yp£}/?6'cyA'S .•s?<ir^|B||HimHHHIIHIiHHHHHHHi 



y^/ ^A'yyyF^ /^!:^y-.... -sr.^y'^HHHHHHHHIIHIHHIHH 



2'2 /.ys/ffoA^ sTAi^/y^- ----^-^^BlHHHHHHHHI^^HHHHIHil 



// ^ozy. sryp^y^y. --^^^^^^^HHUBHHIi^^HHHHHH 



3 sy^/pyyA/'G-- v^^^^HHIHHHI^HHH^HH 



/(? y.oii^ssy /^yPi:>^?6/C/yiyG: 2S/\ 



s yii^yKS^e - 6^^uy:ifVii?<ycyyt^sy:ii^y/y/tsy 



Fig. 10.— Diagram showing the average number of seeds per fruit found on lemon trees of various strains of 

 the Lisbon variety in the investigational performance-record plat. This is a summary of the data re- 

 corded during the 3-year period from July, 1913, to June, 1916, inclusive, except as noted in Table XI. 



the Open strain averaged 5.07 seeds, while those of the Dense- 

 Unproductive strain averaged only 1.67 seeds. The data show that 

 a seed content of about 4.39 is characteristic of the Lisbon strain. 



