4 BULLETIN 1312, U. S. DEPARTMENT OF AGRICULTURE 
in the strongest mixtures was only from 7.17 to 5.78 per cent after 
20 months. In other words, 80.6 per cent of the nicotine originally 
present remained at the end of 20 months, a loss of only 1 percent 
per month. 
Two strengths only were made up with kaolin, because it is such 
a poor absorbent that even the 5 per cent strength was too damp 
for use as a dust. 
TaBLE 2.—Nicotine in nicotine sulphate-kaolin dust 
Strength 2 Strength 3 
Date of analysis Paste Par De P 
aste- ar- aste- ar- 
board |affinea | Glass | Canvas) }oard | affinea| Glass | Canvas 
box | box uae ag box box Jar ag 
1922 Per cent| Per cent| Per cent| Per cent|| Per cent| Per cent| Per cent| Per cent 
NG GY eh Wi 3 MEI i 1 ae eS a i AS ca Sh De 20 Doo 5. 25 Ds2o 2. 49 2. 49 2. 49 2. 49 
Maiyios eee go. epee ee oe 4.92 5.17 9B} 5. 02 2. 48 2. 50 2. 50 2. 50 
FRING (Soa ee et see le oe 5. 03 5. 08 5. 07 5. 06 2. 44 2. 46 2. 45 2. 47 
Septembertsats oes ee a eee ess 4.92 5. 00 5. 08 4.93 2. 33 2. 43 2. 38 2.37 
December 3s2ts2222 2 ae ae 4, 80 AOS asc Fp7 4,81 231 2.39 2. 40 2. 39 
1923 
November 32222 Se he 4,71 4.75 4,92 4, 57 211 2.17 2. 23 2. 03 
The kaolin dusts also showed practically no loss after storage for 
twomonths. (Table2.) At the end of 19 months the loss from the 
stronger dust packed in the canvas bag was 13 per cent of the total 
uantity originally present; the loss from the same dust packed in 
the glass jar was 6 per cent. 
As talcum proved to be the poorest absorbent of the materials 
tested, a dust of the lowest concentration only was prepared with it. 
TABLE 3.—WNicotine in nicotine sulphate-talcum dust 
Strength 3 
Date of analysis 
Paste- Paraf- Glass 
board box| fined box jar 
1922 Per cent | Per cent | Per cent 
12) OF Nese geen OE TAR, eS aL Ue Sal ad Nek eC: st EEA ie oN TG 1.79 1.79 1.79 
Ms PEW G7 fp tate aS SGP AN <3 De a Ea RR FS a oe ee a se RTA! 1. 67 1. 79 
ASD Try 20 23g ON he SF ea, IE ps 2 SE ie a eR ee 1. 65 1. 67 1. 78 
UPTO 20 oe se ee! ee eae ee be ee ces 8 Rt 1. 41 Te Gizé 1.61 
SOP GM 20S Bek es he teas ces Pee eT pe Se SE ae L 0 I eae 1.18 1. 34 1. 64 
1923 
TB) 20 Scars ee cine St ie 8 EE aE eres Sah 2 en eG a ee er 1.10 1.16 1, 54 
ahaliy: 20 eee s Les pea le i OSE etl) eek ee ae a eae ee 1. 00 1.10 1. 45 
PEC 3120 Rete eae eS LP Rey. Meee a tha” _ CR ca vee ea 94 1.00 1.33 
Talcum, dust lost nicotine more rapidly than either the kieselguhr 
or kaolin dust. (Table 3.) The maximum loss was 47 per cent of 
the quantity originally present after 22 months. 
As calcium hydroxide, calcium carbonate, and plaster of Paris were 
very active in liberating nicotine, they will be considered together. 
(Tables 4, 5, and 6.) 
