16 BULLETIN" 601, U. S. DEPARTMENT OF AGRICULTURE. 



time of harvesting. Only a slight difference is recorded between the 

 amount of bacterial rot in the precooled and nonprecooled shipments 

 made in 1914-15, although the holding lots shown in Table IV indi- 

 cated considerably less bacterial rot in the precooled series for the 

 season of 1913-14. Whenever bacterial rot was present it was found 

 to increase greatly after the lettuce was withdrawn from the car and 

 held at a warm temperature. 



PRECOOLED NON PRECOOLED 



PFRrFNTAr AFTER SIX DAY5 IN ICED CAR 



rEnCENTAGt PFBr.FNTAf.F 



,.. ,o .. ,o «. ,. ,o 3o ,o ,o , CAREFULLY CUT, , 



30 40 50 £0 70 



1)78.8 PRIME 46.4 C 



" IIII I I HII I I I I I II IIII I II 1I II IIII I I II I II II I IIIIII 39.2 MARKFTARI F qft.O fTTTTTTI t l l l ll l Ull I I I 1 1 I U I ll l l I ll l inm 



10.8 WORTHLESS 2.01 



' COMMERCIAL 



' CP45.0 PRIME II.5CD 



i w ill HH I ll l Hil i l l ll)l|)lll l l l MI I I| | [| |98.0 MAftKFTABI F A0.6 mTITTTTnniT H>Hl llll il l ll l lll ll » ll 



12.0 WORTHLESS I9-4BBBI 



THREE DAYS AFTER WITHDRAWAL (repacked lots) 

 CAREFULLY CUT 



I 1 31.0 PRIME 10,7 CD 



iiiiiHiiiiiiiiiniiiiiiiiiijiimimii lu gs'; MARKETABLE 89.711111111111111111111111111111111111111111111 



■ 4.5 WORTHLESS I0.3BBB 



COMMERCIAL 



□ 6.4 PRIME 0.0 



Hiiiiiiiiiiiiiimiiii iii uiirmiTn 92.9 marketable ci.Hiiiiiiiiiiiiiiiiiiiiilliililt 



Fig. 12.— Diagram illustrating the percentages of prime, marketable, and worthless lettuce upon withdrawal 

 from the car and three days later in precooled and in nonprecooled commercially cut and carefully cut 

 lettuce held at Palmetto, Fla., season of 1914-15. 



HOLDING LOTS. 



In 1914-15 the holding lots were limited to seven complete series. 

 Because of the shortness of the crop it was not always possible to 

 secure enough carefully handled lettuce to provide for both holding 

 and shipping lots. When this was the case, the holding lots were 

 omitted. 



Table VIII and figure 12 give a record of the market condition of 

 the holding lots for 1914-15. A comparison of these results with 

 those of the previous season, as shown in Table III and figure 8, 

 gives a fairly good idea of the relative quality of the lettuce shipped 

 during the two seasons. These two tables are comparable, because 

 the lettuce in the holding lots was handled in the same manner 

 dming both seasons. The percentages of prime heads in all cases 

 were greater in the 1913-14 lots. To some extent this may be due 



