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 54, 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. 
= a 
s et ta] 
= A Ie) oS 
” 3 : S ‘S| 3 | Resistance in pounds, after 
ig cS s & > = ter a 
ere gid) @ |2| £ 
sae} : a 5 & g 8 = = days. days. days. days. days. 
Sen Gem ee ae st | | 5 = Se tO 15 e025 
A | ore h.m.|d.|h. m.| Ibs. | Ibs. | Ibs. | Ibs. | Ibs. 
}| 37°75}12-25) 200 3 low-red |\2 45} 1 7 10 
g| 40 357 =|200 5 ce 2 30/3 2°75) 7 9:50} 10 
3) 40 357 =|200 red |3 5 15 
4) 56:60}18-40 357 =|200 5 \highest |5 16 2°75) 7 9:50 
Bleo lie 128" 77 red |2 30 7 16 
6). 25 413 200 $ SINSO er HLS 3°75| 4°75 5:50 
750 |15 |357=/200 se 3 45 18 25019 |11 (23 
g| 50 357 =|200 cr PSO ets 4 {10 |17 (24 
g) 50 200 Cael 2 116 275} 7 |10 {11 
10} 60°90/19-10 160 te Aol iG 3 65016 |28 
11| 40 200 Qh tly Igh ia 150] 5:25 7 | 8 
jg} 40 121 77 a 1 30) 4 200/113 |16 {20 
13) 25 100 Bae 2 350 
14| 25 100 | 65 “wig 1 12 |20 22 
15| 75°50/24:50 200 se 40 2) 15 {17:50} 
16 113-25/36-75 200 ss 50 1 30)17. |24 
17) 113:25|36-75 200 “ 30 45|23 26 
18| 37°75)12-25 200 “ 30 30/17 25 
19| 75°50)24-50 200 u“ 45| 1 650/16 
20 40 100 } 67 “ 48) 4% |e" 116 
21 25 100 ss 48| 18 3°50} 3 
22 40 100 “ 29) |16 (|21 |26 
93 119-50) 80-50! = jlow-red |4 
24 119-50} 80:50: red 38 
25 119-50} 80:50) highest; 30 
26, 6 | 2 114 | 78 red 23| 6 2 
97 150 {100 i 23 
98 100 60 highest | 20 
29| 8:10} 3:70 100 | 60 low-red}’ 30] [21 4:50 
30} 8°10) 3:70 100 60 red 30) 1) 4 2 
31} 8:10) 3-70 100. | 60 highest | 20| 1|14 5 
32 140 100 red 27 
33| 25 10 140 100 x 27| 4 2 
34| 60 180 highest | 30] {14 10 
35) 75 150 c 30; 1) 3 10 
36) 58 140 3: 20) 1 i 
37| 53-60/46-40 200 “ SO ye | Libb 24 
38] 53-60/46-40 100 = 30} {14 8 
39) 50-58/ 16-42 200 5 30} {17 8 
40| 37-°75)32-25 83°60) 56-40 cs 30) {12 20 
41 40 100 x 30 11 
42 150 =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 ox- 
ide of manganese, but in no instance, where this substance was mingled 
with pure lime, did he succeed in obtaining any good result, nor was he 
Vol. xt1x, No. 2.—July-Sept. 1845. 49 
