82 BULLETIN 846, U. S. DEPARTMENT OF AGRICULTURE. 
EFFECT UPON THE ACIDITY OF THE Fat DETERMINATION OF USING THE KNORR OR 
JOHNSON APPARATUS. 
Table 35 shows the effect upon the acidity of the fat determination 
of using the Knorr apparatus and Johnson apparatus. 
TaBLE 35.— Acidity of fat obtained by using the Knorr apparatus or Johnson apperatus. 
Knorr. Johnson. 
Initial of analyst. Using Using Using Using 
2.54 5.04 2. 54- 5.04 
grams. grams. erams. grams. 
——— a 
Cc. N/20| Cc. N/20| Cc. N/20| Cc. N20 
sodium | sodium | sodium | sodium 
ethylate | ethylate | ethylate | etl ylate 
per gram. | per gram. | per gram. | per gram. 
. 09 2.15 2. 21 
18s So onde “sO nceo seus ae snauar Cap ocosseSeaa Sea sA8 Ss 2. 22 
ID SS Sse des 35 6b S5aaSse 555 sobade aoe donde daddobGdgae 2. 95 2.18 2.13 2.09 
ALG xfeee cere sateen hae arn see ents ocala aeals aaeemcte melmarete cise 2.39 2. 08 1,91 1.91 
138 Sabon bo Seno asern so soeere Soe eoaoaccosuEDdopoues 2.61 2.33 2. 48 2.19 
SaeSSS0bdes 555555 5 shoal Ses Sasso paSDooesaleocuenauades 2. 22 2.17 2. 07 Pil 
EES Bae ora ote) Heys aay Bee sesh aera s Se ioie wiefa eae ie eiaeee are eee 2. 09 1. 69 1. 88 1. 67 
18 Oe ey as a8 ont A Sa eee Th ApH bee SEuooUdEpES 2. 59 1.80 2. 21 1.89 
13 iaaaaes 6 DeReee ans eae amn ts COO OUE Soin aes ebanec 2. 30 2.19 2. 06 1,78 
SS seen See acs ee Sener te te ee ee Ee pai 2. 21 1.95 2. 03 1.97 
1D als See eee ceden Sega Dabs 4 SHeb pose na SonneDbSEonp sSOoEF 2.70 2. 27 2. 54 1.88 
1 1Dy Sh Senne Sah oseea eos ane oee See oeE hee bosSSooe 1.85 1.50 1.55 1 Ge 
12 tt Sees 6 OEE ae Seen Kee Rennes See err ere ne 1.93 2. 09 1.63 1.65 
Sree or eee ssa eee = enna danow sean saaeeamee 1.95 1.69 1,92 1.74 
Disuacandos Ss sean cancsseeonecus] sesuSsopeUSoooDSEscocd _ 2.91 2.21 2. 43 1.93 
3 PHS So iaic Satchels sic eS taae eis ein NA aes Sais SAA eS 1.72 1.51 1.74 1.52 
Jel hg pooboe ssoscsboeseua es onesendeobaosHOSUSoeCsOedeS 2.13 2. 05 1.52 1.70 
PS EER AE eee hs sar Eee em ese Hie ae aee ib 7Al 1. 67 1.74 1. 62 
DD: tabees Bess Nass ce ec Ss Sepy Sots Bee ice eee? ee 4, 48 3. 34 2. 78 2.47 
1s} | PIB LSS Boe SaaS SeSoo does soe sess sunooos oso sooebobeSoUode 2.71 2.71 2.35 1.90 
i555 senonodooneess seems anos eaeSootaboSsecuaboade a 55 1.81 1.94 1. 79 1.81 
DAN OL AL Ot Pesaro ane ote Sots Ae el eee eee ee epioete eee 2. 22 1. 96 
User oF DuUBOSCQ AND SCHREINER COLORIMETERS IN THE NESSLERIZATION METHOD 
FOR AMMONIA NITROGEN. 
As many food laboratories are equipped with Schreiner color- 
imeters and not with Duboscq instruments which have always been 
recommended for this work, a series of comparative tests was made 
with the two instruments, using the same solutions in both instru- 
ments. The results are given in Table 36. 
