16 BULLETIN 601, IT. 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to increase greatly after the lettuce was withdrawn from the car and 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 
PERCENTAGE AFTER S ' X DAYS ,N ,CED CAR 
PERCENTAGE fARFFIIIIV r I IT PERCENTAGE 
JOO 90 60 TO SO 50 40 30 20 10 O Ks/\ I\ U V ULLY LU lo 
20 30 -40 SO 60 70 80 90 
7 S-8 PRIME 46.4C 
" ■ ' ■■ " ■ ■ i " 1 " 1 " im i inun i in QmniD 99.^ MARKETARtF M.o iniTinmi mmim i i i i i iiitimmiiiii iii i i 
10.8 WORTHLESS 2.01 
_____ COMMERCIAL 
' =145.0 PRIME H.5CZZI 
i u iiiii i ii i iiiiii i i ilHHIHlli | ||| l n mniIini98.o marketable AOjc imrmmT idiniim ii ii i HinnmiH 
12.0 WORTHLESS I9.4HBBE 
THREE DAYS AFTER WITHDRAWAL (repacked lots) 
CAREFULLY CUT 
' 1 31 A PRIME I0.7CZD 
il i i i i m ii ii i i ii iin_HM_i i i ii niim ii il i r «>.s.q MARKETABLE 83.7111111111111111111111111 If 1IUI III! H IIIIMI 
■ 4.5 WORTHLESS 10.3 ■■ 
COMMERCIAL 
□ 6.4 PRIME 0.0 
i iiiiii i ni i iiiii i innim i iii i nmi i i EniiD92.9 marketable ei.ii i i i iii mi ii ii i i i i iiii iiini) 
■19.1 WORTHLESS 5S.9 B&BBBBHB 
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 
during both seasons. The percentages of prime heads in all cases 
were greater in the 1913-14 lots. To some extent this may be due 
