g6 Williamson . — Some Experiments on the Action of 
No. of 
Scotch 
Pine. 
No. of 
Plate. 
Condition 
of Wood. 
Temp, and Time 
of Exposure. 
Type of Wood. 
Spring 
Wood. 
Autumn 
Wood. 
220 
49 A 
Moist air 3 days 
40° C. 
24 hrs. 
Mostly heart- 
+ 
_ 
wood 
58 
Dried at ioo° C. 
77 
2 4 „ 
Do. 
+ 
_ 
101 
Do. 
2 7 °C. 
72 „ 
Do. 
+ 
_ 
135 
Moist air 3 days 
4o°C. 
9 6 !> 
Do. 
+ 
_ 
140 
Dried at ioo° C. 
,, 
21 >> 
Do. 
+ 
_ 
161 
Do. 
7 7 
2 4 „ 
Do. 
+ 

.192 
Steamed 12 hrs. 
77 
120 ,, 
Do. 
+ 
and left 41 days 
260 
30 
Dried at ioo° C. 
30° C. 
72 hrs. 
Heart-wood with 
small sap-wood 
at one edge 
+ 
42 
Moist air 3 days 
50° C. 
21 „ 
Do. 
+ 
— 
44 
Dried at ioo° C. 
77 
24 „ 
Do. 
+ 
— 
45 
Do. 
77 
5 }) 
Do. 
+ 
— 
hi 
Moist air 3 days 
4- 
0 
z 0 
O 
120 „ 
Do. 
+ 
— 
128 
Dried at ioo° C. 
9 6 » 
Do. 
+ 
_ 
148 
Moist air 3 days 
77 
48 „ 
Do. 
+ 
— 
482 
55 
Dried at ioo° C. 
40° C. 
24 hrs. 
Sap-wood 
+ 
_ 
109 
Do. 
77 
72 „ 
Do. 
+• 
— 
482 
Moist air 3 days 
„ 
108 ,, 
Do. 
+ 
— 
134 
Do. 
77 
9 6 „ 
Do. 
+ 
— 
138 
Dried at ioo° C. 
77 
21 „ 
Do. 
Activity all over 
159 
Do. 
77 
24 » 
Do. 
+ 
— but 
4 
some ac- 
tivity 
190 
Steamed 12 hrs. 
77 
120 „ 
Do. 
+ 
_ 
and left 41 days 
In the foregoing cases, whatever the time or temperature of exposure or 
condition of moisture of the specimen, the result shows that the spring wood 
is positive, giving a dark ring on the film, and the autumn wood is negative. 
These all agree with Dr. Russell’s results. Other cases show exactly the 
reverse image : 
No. of 
Scotch 
Pine. 
No. of 
Plate. 
Condition 
of Wood. 
Temp, and Time 
of Exposure. 
Type of Wood. 
Spring 
Wood. 
Autumn 
Wood. 
191 
50 
Moist air 3 days 
4 o°C. 
24 hrs. 
Sap-wood 

+ 
Fig. 5 
105 
Do. 
27 0 C. 
72 „ 
Do. 
- 
+ 
no 
Do. 
40° C. 
? 
Do. 
— 
+ 
191 
Do. 
77 
108 „ 
Do. 
— 
+ 
156 
Do. 
7 7 
9 6 » 
Do. 
_ 1 
+ ? 
200 
Do. 
77 
72 „ 
Do. 
— 
+ 
Fig. 6 
5 54 
Dried at ioo° C. 
77 
24 •„ 
Do. 
+ 
— 
1 126 
Do. 
77 
96 „ 
Do. 
— 
47 1 
112 
Moist air 3 days 
40° C. 
24 hrs. 
Heart-wood 

+ 
Fig. 7 
136 
Do. 
77 
9 6 „ 
Do. 
— 
+ 
195 
Do. 
77 
96 ,, 
Do. 
— 
+ 
218 
Do. 
17 
144 » 
Do. 
— 
+ 
224 
Do. 
77 
120 „ 
Do. 
— 
+ 
5 i°7 
Dried at ioo° C. 
77 
24 » 
Do. 
+ 
— 
i 127 
Do. 
77 
96 „ 
Do. 
+ 
- 
