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SCIENCE AND! INDUSTRY. 
raw products, a theoretical yield of alcohol is not to be expected, and 
consequently starch percentages calculated from alcohol results tend to 
be low. On the other hand, not all of the fermentable sugar present 
after hydrolysis is necessarily due to starch, and this tends to make the 
starch percentages higher than they really are. In the present inyesti- 
gation it is considered, in view of certain tests made, that nearly all of 
the fermentable sugar was derived from the inversion of starch, and 
consequently the figures given for starch in Table III. may be low, 
but only to a slight degree. 
TABLE III.—MACROZAMIA INVESTIGATIONS. 
Percentage of Starch calculated from Yield of Alcohol. 
a Reference Per Cent. Be ACat Bet Cent. 
pease Number. Tinga Ones Core. Whole Bulb, 
Bateman’s Bay 1 5:23 9°05 8:19 
” ” 2 11°52 13°58 13°12 
” ” 3 7°76 6:16 6°58 
” ” 4 8°78 Te27 7°74 
” ” 5 12-30 6°66 8:11 
” ns 6 12:05 3°93 7°38 
” ” 7 12-70 4°77 8°68 
Wyong 1 1:56 4:79 4:24 
” 2 6°63 9-00 8°38 
oa 3 4°43 3°51 3°70 
Murwillumbah 1 0°88 0°43 0°44 
ty, 2 2°57 0-89 1-90 
. 3 4°72 0°18 3°10 
The results from Bateman’s Bay gave the best and most consistent 
results, and on summing these up it is found that 531 Ibs. inner core 
gave 4.025 gallons alcohol, equivalent to 17.78 gallons (18.67 of 95 per 
cent.) alcohol per ton; 905.5 Ibs. outer core gave 4.214 gallons, equi- 
valent to 10.48 (10.98 of 95 per cent.) gallons per ton; while 1.436.5 lbs. ; 
of the whole bulbs gave 8.435 gallons, equivalent to 13.13 (13.82 of 95 
per cent.) gallons per ton. The percentages of starch corresponding to 
these figures are—inner core, 11.06; outer core, 6.51; whole bulb, 8.19 
per cent. 
Bulletin No. 6, on the subject of Power Alcohol, issued by the 
Institute of Science and Industry, contains a table, page 19, giving the 
percentages of alcohol obtainable from various substances. The yield 
from macrozamia is set down as 18 gallons per ton. This figure refers 
to the alcohol obtainable from the inner core, and is thus in agreement 
with the average figure from the inner cores of the Bateman’s Bay 
series. 
The age of the bulbs and the rapidity of growth has a very important 
bearing on the question of utilizing macrozamia as a source of industrial 
alcohol. Professor Lawson stated at the outset that the growth of these 
plants is very slow indeed. This was confirmed by an examination of 
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