e 
18 BULLETIN 880, U. S. DEPARTMENT OF AGRICULTURE. 
words, the 12-hour smoking period consisted of three stages, approxi- 
mately as follows: Four hours were required to bring the temperature 
of the smokehouse to or near the maximum to be attained; during the 
next four hours the smokehouse was kept at about the maximum 
temperature, and finally the temperature was allowed to go down 
gradually to 90° F. or at least to approach this temperature. a | 
This method of smoking following an adequate curing period 
proved to be efficacious in destroying the vitality of trichine, as the 
data presented below will show. The records are seen in Tables 
9, 10, 11, and 12, grouped according to the establishments at which 
the experiments were conducted. | 
TABLE 9.—Experiments with fresh summer sausage. 
(ESTABLISHMENT 2A.) 
Preliminary curing. _| Smoking. 
| 
Tem- : Tem- g Tem- Results of 
‘ pera- | § pera- S) pera- tests on ys 
S : ture. 3 ture. 2 ture. animals - 
Z Source of| § m & at Chi- 
= meat. rs) = b> : Temperatures of smoke- 
S| : : pe o and 
g Sidgid|/sc /di¢d A |g g house, °F.1 Washing- 
| goiise|(s | 2eibS Wis: eeeoeas ion. 
5 @ 18) 5. @ 1 Se 8 | tee Le ie 
a 213/818 |s/8/] 8°18 1s 
i) BlSslia]/e els) S sails 
Hog Days (°F °F \Days.| °F.| °F. Hours.|° F.| °F. 
118 | 7 : ET pe a bestepigl Bs 12} 130) 100, 100, 108, 108, 110, 112, 118, 118, | (2). 
| 120, 120, 121, 128, 130, 118. 
3| 36 34, §| 65] 63 12] 126) 180 100, 108, 118, 124, 126, 124, 118.| Negative. 
TELIA eh ey ea 3| 38 35/ 131 60] 51 12| 128) 82) 82, 91, 99, 111, 118, 127, 128, | (3). 
| | | 128, 126, 127, 115, 99, 95. 
120| 12and13.; 3] 36 33 2 64] 68 12| 126; 90, 90, 99, 110, 120, 126, 126, 126, | (). 
| 126, 126, 114, 114, 114, 115. 
121} 14and15.} 1§ 39 35) 1] 65] 60} 12] 127| 78| 78, 88, 97, 103, 105, 124, 127, | Negative. 
|  193,'124’ 127,119, 114, 111. 
122 | 16and17.|. 3] 411 37] 2| ‘7il 67 24] 130) 80 80,81) 83, 84, $4, 84, 84, 94,108,] Do. 
| 427, 130, 127, 127, 127, 116, 
/ 103,106 
123 | 18and19.) 3] 44) 35] 231 70] 62 15| 130) 72 72, 80, 90, 102, 109, 118, 125,} Do. 
130, 128, 128, 126, 119, 111, 
110. 
124 | 18and 19. 
127, 128, 129, 122, 112, 110. 
| 
41] 341 521 71] 63) 4 m) 80, 80, 82, 89, 109, 112, 127, 126,} Do. fs 
| 5 
| 76| 76, 92, 111, 126, 128, 127, 127,| Do. 
125 | 20andQ1. 43} 40] 23| 72l 65| 15) 128) 
| | 128, 122,119, 114, 111, 108. 
| 129) 96 96, 108, 129, 129, 129, 120,110.. Do. 
3 
3 
126! 22and23.| 4] 46 37) 1| 86 ail 
53i4 45] 236 [ere [oe | 12) 131, 94 94, 107, 112, 122, 128, 130,129,| Do. 
12 
127 | 24and 25. 
| | | 131, 130, 121, 114, 109. 95. 
128 | 26and27.| 44! 40 33/ 1/| 68] 63] 12) 130) 90) 90, 95, 98, 121, 128, 130, 130,| Do. 
| | 130, 130/121,115,110,104. | 
129 | 28and29.| 4] 39 35 131 66] 62 12) 132) 97) 101, 102, 109,120, 129,130,131, | Do. 
| | | 130, 132, 116, 105, 102, 97. 
13051 G0! a eae 4| 42) 37] 18! 65] 59 12) 130] 94) 94, 98, 104, 123, 129, 128, 130,| Do. 
| : | | 129,129,121, 114,108,990. | 
ZIM AG tees. es 5| 41, 37|/ 1] 62) 61! 12) 131) 90) 95, 102, 110, 117, 128, 130,130,| Do. 
| | | | 131, 129, 118, 104, 97, 90. 
132 | 32and33.| 4$) 46 381 1] 64] 62 12) 130/ 90) 90, 99, 113, 121, 129, 130,129,} Do. 
| pes (ea 130, 130, 120, 110, 98, 94. 
ie) | eee eee 4| 42} 36 12! 60] 59 12, 129) 90) 90, 100, 109, 118, 129, 138, 129,|] Do. 
i | oe | | | _ 128, 128, 123, 115, 101, 90. 
134|35and36.| 441 40) 35| 12] 701 67 12 129) 92) 92, 106, 114, 120, 128, 129,128, Do. 
| | an 129, 129, 119, 113, 108, 102. 
A535 PS Too cl 43) 43) 37, 1| 77] 74 12 130} 91 91, 102, 112, 117, 138, 129,129,| Do. 
jae (pea aoa | | 130, 130, 121, 114, 109, 105. <N 
1361) BS 54140) 36) 1 |..--- Be 12 132} 95) 95, 102, 110, 119, 128, 129,129,| Do. 
| | a | 132, 130, 118, 110, 104, 100. 
1 The temperatures were taken at the beginning of each hour and are given in the order in which they 
were taken. In a few cases the temperatures were taken once in 2 hours. 
2 Negative at Chicago; no tests at Washington. 
3 Negative at Chicago; positive and negative at Washington; see pages 20-21. 
4 Positive at Chicago; positive and negative at Washington; see page 21. 
6 In addition to 2 days at 71° to 63° F., this sausage was held 15 hours in an unused smokehouse at an 
undetermined temperature. 
ie ene rat out of 3 at establishment 2A showed one trichina well encysted, evidently from a previous 
ection. 
