THE MACADAMIA NUT IX HAWAII 5 
Table 2.— Relation of specific gravity and oil content of macadamia nut kernels 
KOIGH-SHELL TYPE 
Oil content 
Oil content 
Oil content 
Dovia- 
Devia- 
Devia- 
Specinc 
gravit y 
El OCT 
Calcu- 
lated 
from 
f i f 
calcu 
I'll "■' t 
Bpecific 
pr.ivit v 
Et hiT 
Calcu- 
lated 
from 
tion of 
calcu- 
lated 
Pjiecific 
j.'r:i\ it v 
Et her 
Calcu- 
lated 
from 
tion of 
calcu- 
lated 
extrac t 
\ lllll 
» \tr. 11 1 
1 xtract 
equa- 
fi|ii'i- 
tion 1 
fr'lin 
equa- 
tion 1 
frorn° 
tion 1 
et her 
extntct 
ct her 
extract 
et her 
extract 
Per- 
Per- 
Per- 
Per- 
Per- 
p,, 
Per- 
Per- 
Per- 
cent 
cent 
cent 
cent 
cent 
cent 
cent 
cent 
cent 
0. 9692 
B6t 28 
*o. ;{9 
+0. Of) 
0.9914 
74 *9 
75. 10 
0.21 
1.0463 
61. 55 
62. 01 
0. 46 
.97119 
7s 7:< 
79. 99 
1.26 
. w:<s 
75. 65 
74. 53 
-1. 12 
1.0464 
62. 29 
61.99 
-. 30 
. 0784 
79. IX 
7s. (17 
-. 51 
.9947 
73. 03 
74.31 
1 2s 
1.0488 
6,11. 35 
59. 1 is 
-1.27 
.9783 
76. 12 
7s. 22 
2. 10 
. 8868 
71. 5s 
73 79 
-.79 
1.04*9 
60. no 
61. 39 
1.39 
.9H12 
77. 68 
77 r.\ 
-. 10 
1.0018 
73. 92 
72. 74 
-1. 18 
1019S 
61. 06 
61. 18 
. 12 
. 9S-'9 
7& 71 
77. 13 
-1.58 
L0086 
71 02 
71. 60 
.48 
1.0534 
SO. si 
60. 32 
.51 
9*3* 
7^. (17 
76.81 
-1. 16 
1.0115 
70. mi 
70.31 
-.29 
1.0668 
:.s 92 
59. 49 
.57 
. 9H47 
76 83 
76. 7n 
-. 12 
1.0116 
09 *0 
70. 88 
.43 
1.0.587 
59. 1 1 
59. 06 
-.05 
9*72 
75. 6S 
7tf. 10 
.55 
1.0173 
69 51 
r,s 93 
-.61 
1.0822 
58. 90 
-.68 
ten 
76. 1 5 
76 us 
-.07 
I. 0249 
07 7-' 
87. 1 1 
-.01 
1.0837 
54.68 
53. 10 
-1.58 
. 9Vs") 
76. s7 
75. 79 
-1.08 
1.0374 
64. Is 
m. 1 1 
-.04 
. 9910 
71 <;» 
75. 2t) 
.52 
1.0414 
62. 79 
63. 18 
.39 
SMOOTH-SHELL TYPE 
it. won 
Ml 36 
so 57 
0.21 
0. 9*70 
71 2s 
71 S9 
0.61 
1.0141 
6s is 
69. 13 
0. 65 
. 9739 
78, o7 
77. 88 
-.39 
. 9s 7 2 
75. 24 
74. 85 
-.39 
1.0144 
68. 56 
69. 07 
.51 
. 9756 
76. ss 
77. 32 
.41 
.9*73 
75. 33 
71 S3 
-.50 
1.0157 
69 117 
68. 79 
-.28 
. 9757 
n n 
77 88 
1.51 
. 9H9II 
71 -.7 
71 17 
-.20 
1 019s 
66. 54 
67. 92 
1.38 
.9758 
7s n 
77. 27 
-1.05 
.9921 
71 67 
73. 75 
-.82 
1.0221 
6s (12 
67. 43 
-.59 
. 9765 
79. 68 
77. 12 
-2. 43 
.9925 
73 95 
73. 72 
-.23 
1.0227 
67 69 
67. 30 
-.39 
.9791 
76. 39 
76. 57 
. 1H 
. 992s 
72 34 
73 06 
1.34 
1.0237 
66. S9 
67. 09 
.20 
. 9793 
77. 08 
76. 68 
-1.40 
. 9959 
73. 33 
73. 00 
-.33 
1.0246 
65. 92 
66.90 
.98 
.9801 
74. 63 
70 36 
1.84 
Loou 
73. 211 
71 s7 
-1.33 
1 024S 
66 72 
66 si, 
. 14 
. 9*02 
77. 05 
71V 34 
-.71 
1.0017 
72 CO 
71 77 
-.83 
1.0388 
66 02 
65. 97 
-.05 
. 9805 
74. 55 
76. 2H 
L 73 
L0081 
7(i 35 
71.47 
L 12 
1.0801 
66. 02 
65. 73 
-.29 
. not 
76. 17 
76 n 
-. 12 
L0086 
70 s; 
71. 39 
.52 
1.0329 
61. s;, 
65. 14 
.29 
.gsifl 
76. 88 
76. 04 
- *4 
1.00*17 
71. 51 
70. 71 
-.80 
1.0866 
64 51 
64. .58 
.04 
. 9*24 
74. 68 
75 s7 
1. Is 
1.000* 
71. 41 
7(i 6s 
-.73 
1.0371 
63. SO 
61. 24 
.44 
. 9*2* 
75. 12 
75. 79 
,m 
1.006M 
70 93 
70 68 
-.25 
1.0433 
62. 57 
62. 93 
.36 
. 9*3 1 
74. 13 
75. 66 
1.53 
1. 0076 
70. 68 
70. 51 
-.02 
MM 75 
63. 05 
62. 03 
-1.02 
. 9*36 
74. HO 
75. 62 
LOB 
1.00*0 
7(1. 31 
70. 43 
. 68 
1.0686 
61. 02 
60. 76 
-.26 
. !N!l 
76 38 
75.55 
-.84 
1 00*5 
71.42 
70. 32 
1. 10 
1.0539 
59. 79 
60. 67 
.88 
. 9852 
76.01 
75. 28 
-.73 
1.0107 
70. 57 
69 S6 
-.71 
1.0.545 
60. 50 
6(1. 51 
- 06 
.9864 
74. 19 
75. 02 
.83 
1.0136 
69. 49 
69. .'1 
-.25 
1. 0740 
56. 02 
56. 40 
.38 
' Equations (1) and (2) which are the best fitting COTVM <>f Specific gravity/ether extract of the rough-shell 
and smooth-shell tyi>es, resj natively (see below). 
The coefficients of correlation of specific gravity and percent oil, 
calculated from data in table 2, are as follows: 
Smooth-shell type— r= — 0.979 ±0.005 
Rough-shell type— r= —0.985 ± 0.005 
The degree of correlation is sufficiently high to permit the use of 
the specific gravity as a measure of the percentage of oil in macadamia 
kernels. In figure 1 the best fitting curves which relate specific 
gravity to percentage of oil are given for the two types. The equa- 
tions for these graphs are as follows: 
(1) Smooth-shell type— y= —212.57^+284.70 
(2) Rough-shell type— y= -238.35^+311.40 
where 7/ = the percent of oil in the kernel and £=the specific gravity 
of the kernel. 
