Bibliography. 381 
ployed, it was moistened, and the material subsequently heated in pla- 
tinum crucibles, open, but ina close stove. The comparative hard. 
ness was ascertained by a test needle ;1, of an inch in diameter, which 
was held firmly in a vertical position, and the specimens were submit- 
ted to trial without being removed from the vessel containing them. 
The following is Lt. Kendrick’s table of results, with some unim- 
portant omissions. 
: & 
| afil: 
& a a g : 
= : S 3 = | Resistance in pounds, after 
5 fog | ‘ & 4 fa) = Ss ; 
s| ¢]a g| 2 1a] 38 
33 ee gle] § & 8| § S x days. days. days. days. days. 
z\_@ a |< re) = |e) 8 a ~ a WwW bb 60 4 
bee -m.|d.{h. m.| Ibs. | Ibs. | Ibs. | Ibs. | Ibs. 
1) 37°75] 12-25 3 low-red 2 45| 1 7 10 
9} 40 357 = 5 = 30 275) 7 9:50) 10 
31 40 357 =|200 ee ed 15 
4| 56-60)18-40 357 = 5 \highest 16 9-75). 7 9°50 
51 25 113 77 30 16 
G25 30 18 3-75] 4°75 5°50 
750 115 (3571200 2 45 18 30019 111 {23 
g) 50 & 30 4 110° {1 24 
9) 50 “ 2116 | 275) 7 |10 jl 
10) 60-90}19-10 160 “ 45; 1/16 3 | 65016 |28 
14| 40 : Sh: 4 1:50) 5°25;)°7 ps 
yy) 40 12k.” E97 “ 30| 4 200113 [16 |20 
13) 25 100 ihe die 350 
25 100 | 65 “ , 1 12 ) |92 
“ 40 7 1S 1-50 
* 50 1 30)17 
200 . Lig 30 45 23 
es id. |, 3017 
200 ‘ 45\1 650; 
100 67 bi 48 17 16 
100 “ 48| 118 3:50) 3 
“ 29; {16 [21 |26 
119-50} 80-50! low-red|4 
119-50} 80°50) 33 
11950} 80:50) [highest | 30 
114 | 78 23) 6 2 
150 {100 23 Ms 
100 | 60 highest | 20 
100 | 60 low-red}| 30} (21 450 
100 | 60 re 30; 1] 4 2 
100 - | 60 highest | 20) 1|14 5 
100 27 
140 100 = 27) 4 z 
180 highest | 30) {14 10 
150 “ 30;1) 3 /10 
40 “s 90) 1 11 
“ 30 1 55 24 
100 “ 30} |14 8 
200 a“ 30}. 17 8 
83-60) 56-40 be 30} 112 20 
100 “ 30 11 
150 1100 red 45 
“Tn addition to the above, a series of experiments was performed by 
Lt Kendrick, with the view of testing the hydraulic virtues of the oz- 
ide of manganese, but in no instance, where this substance was mingled 
with pure lime, did he succeed in sipaur any good result, nor was he 
Vol. xxix, No. 2.—July-Sept. 1845. 
