Salts of Copper, Cobalt, and Nickel, with respect to Atmospheric Moisture. 
OBSERVATIONS ON HYGROSCOPIC AND DELIQUESCENT SALTS. 
Cotumn I.—Date of observation. 
” 
”» 
IJ.—Tension of aqueous vapour in inches of mercury. 
I1J.—Mean temperature of twenty-four hours. 
W, weight of salt taken. 
W’, increase of weight per 100 parts of salt. 
d1d 
If, | II. | III. CuCl2:2H20. | CuBre. CoCl26H20. CoBr2"6H20. NiBr26H20. Nile'7H20. 
1899. oy W W' W Ww! W Ww’ W Ww’ W W’ W W' 
November 15, 11-6207 100 6°7010 |} 100 7°6789 | 100 
- Np 61 7:1740 | 100 3-7608 | 100 3°1269 100 
- 20, 59 7°2600 | +1-20 |} 11°9022 |+2°423 || 38-8408 | +2°13 7°2305 |+7:90 8:-0549 | +4:90 || 3°4684 |+10°92 
- 22, 62 7°3292 2°16 || 12°03818 3°53 38°9263 | 4:14 74660 | 11°42 8-6402 | 12°50 || 8°7684 | 20°52 
-) 24, 59 7°3460 2°34 || 12-1207 4°30 3°9628 | 5°37 7°6650 | 14°38 9-0639 | 18:04 || 4°0174 |] 28°48 
1 28, 57 74055 8-28 || 12°2587* | 5°49 4:0581 | 7:77 7°9513 | 18°66 9-7909 | 27°50 || 4°33884 | 38°58 
December 1, 56 74340 3°62 || 12°4427 7°80 41043 | 9°14 8°3730T | 24-95 || 10°2754 | 86-42 || 4°4799 | 43°24 
9 4, 65:4 7°4485 3°83 || 12°5532 8-02 4-1348 | 9:94 9°5975 | 48:23 || 10-5709 | 37°66 || 4°5664 | 46°04 
5 Up 51°5 7:°5765 5°61 || 12°7982 | 10-09 4:2778 | 13-75 9°8445 | 46-91 || 10-9792 | 42-98 || 4:72384 | 51-05 
op 1l, 48°2 7°5960 5:90 |) 12°9142 | 11°13 4°3108 | 14°62 9°9710 | 48-80 || 11-2469 | 46°46 || 4°7624 | 52°30 
- 13, 53°7 76095 6°09 || 12°9960 | 11-83 4-3288 | 15-10 || 10:03890 | 49-81 || 11-°3602 | 47-94 || 4:7795 | 52°84 
- 15, | 0-278 | 47:9 7°5850 5:74 || 13°02388 | 12°20 4-3049 | 14-47 || 10-1810 | 51-93 || 11-4173 | 48-68 || 4°7678 | 52°42 
p 18, | 0°265 | 48°5 7°6080 6°42 || 138°13863 | 13°04 4°3358 | 15-29 || 10°2080 | 52°33 || 11:5282 | 50-06 || 4°8157 | 538-99 
20, | 0°384 | 54:5 76475 6°61 || 18°2847 | 13°89 4°3913 | 16°76 || 10°3455 | 54°87 || 11-6314 | 51-47 || 4°8690 |} 55°71 
ne 22, | 0°334 | 54°5 7°6760 7-04 || 18°3227 | 14°65 4:4328 | 17-87 || 10°4445 | 55-86 || 11-7834 | 58-80 || 5°0789 | 62°43 
29, | 0-298 | 49-5 7°8150 8:07 || 18-5767 | 16°83 4°5678 | 21-19 || 10°6800 | 59°38 || 12-0104 | 56°40 || 5°1284 | 64-03 
1900. 
January 4, | 0°281 | 49°5 %-9740 | 11:14 || 138°8627 | 19°29 4-7268 | 25-69 || 10-9174 | 62-92 || 12-2642 | 59-71 || 5:2084| 66°45 
y 15, | 0°319 | 50°0 8:2660 | 15°28 || 14°3641 | 28°61 5°0853 | 33°87 || 11:1450 | 66°32 || 12-6149 | 64:28 || 5°2487 | 67°86 
* 19, | 0°322 | 50-0 82800] 15:41 || 14:4857 | 24:27 5°0695 | 34°79 || 11°2550 | 67-96 || 12-6229 | 64°38 |] 5°1884 | 65°91 
2 22, | 0°302 | 52:0 8°32385 | 16-06 || 14°5264 | 25:04 5°1254 | 36°28 || 11°2815 | 68°35 || 12-6699 | 65-00 || 5°1984 | 66°15 
26, | 0-338 | 52°9 8:°4165 |} 17°82 || 14°7022 | 26°55 5:2348 | 89°16 || 11-3790 | 69-81 || 12-7629 | 66-21 || 5-1914| 66-00 
- 29, | 0°255 | 47-75 || 8:4035 | 17-12 || 14°7194 | 26°69 5°2578 | 39°28 || 11°33890 | 69-21 || 12°7294 | 65-77 || 5°1219 | 63°82 
February 2, 0°2538 | 49:0 8:4105 | 17°27 || 14-7632 | 27:07 5°2660 | 40°02 || 11°3190 | 68-91 || 12°7276 | 65:52 || 5:0694 | 61°50 
os 5, | 0°233 | 47°75 || 8°3750 | 16°70 || 14°75382 | 26°99 5°2468 | 39°52 || 11°2645 | 68:10 || 12-6726 } 65-04 |! 5:0094 | 60°21 
. 9, | 0-245 | 46°5 8-2975 | 15°66 || 14°7227 | 26°71 5°1893 | 37-94 || 11°1805 | 66-85.|| 12°5894 | 64-86 || 4°9381 | 57:92 
- 12, | 0°216 | 41-5 82448 | 14-90 || 14°7057 | 26°88 5°1478 | 36°35 |) 11°1252 | 66-02 || 12-7944 | 66-62 || 4°8664 | 55°64 
0 16, | 0°269 | 49-0 8:2475 | 14-95 || 14°7742 | 27:14 5°1613 | 37:22 || 11-1360 | 66-18 || 12-7604 | 66-38 it 
op 19, | 0°287 | 48°25 |) 8°2623] 16-14 || 14°8330 | 27-04 5°1861 | 37°85 || 11°1520 | 66°42 || 12-7604 | 66-18 || 4°8944 | 56°53 
0 26, | 0°328 | 55°5 8°2715 | 15°29 || 14:°9572 | 28°71 5°2545 | 39°72 || 11°1443 | 66-30 || 12-7149 | 66°33 || 4°9324 | 57°77 
March 2, | 0°274] 51 8°24387 | 14:90 || 14:°9852 | 28:95 5:2488 | 39°58 || 11°0765 | 65°15 || 12°6584 | 64-85 || 4:8961 | 56°58 
S 5, | 0°281 | 50 8-2255 | 14°74 || 15-0027 | 29°11 5°2343 | 39°18 || 11°0803 | 65-20 || 12°6269 | 64°45 || 4-8659 | 55°65 
cr 9, | 0°274 | 52 | 8°1235] 18°22 || 14-9569 | 28°71 5°1748 | 37°56 || 11°9718 | 68-78 || 12°4875 | 62°60 |} 4:8034 | 53°69 
9p 12, | 0-285 | 51:75 | 8-0901 | 12°75 || 14:9767 | 28°89 5°1611 | 37°22 || 10°955 63°48 || 12-4564 | 62-20 || 4:7859 | 52-80 
16, | 0°282 | 52°25 | 80096) 11-64 |} 14-9775 | 28-89 5-1300 | 86-88 |} 10-8730 | 62:26 || 12°3604 | 60-98 || 4-7690 | 52°45 
- 20, | 0°256 | 48°9 7:9022 | 10:14 || 14°9480 | 28°59 5:0612 | 34°55 || 10-7705 | 60°73 || 12-2774 | 59°87 || 4-7019 | 50°38 
‘ 23, | 0°298 | 51°25 || 7-9180| 10°39 |} 15-0082 | 29-13 50993 | 35°55 || 10°8375 | 61-73 || 12-3574 | 60°25 || 4°8374 | 54-69 
. 26, | 0°240 | 47-4 | 7°8735 9°78 || 14-9862 | 29:98 5°0718 | 84°82 || 10°8110 | 61°33 || 12°2619 | 59-65 || 4°8084 | 53°76 
0 31, | 0°328 | 54:0 7°7105 7°52 || 14°9527 | 28°67 4-9725 | 32°20 || 10°7070 | 59-72 || 12-:1244 | 57:88 || 4°6254 | 47-94 
April 38, | 0°306 | 52°5 7:6578 6°82 || 14:°9655 | 28°79 4-9419 | 31:39 || 10°7027 | 59:66 || 12:0981 | 57-46 || 4:°6184 | 47-52 
2 7, | 0°881 | 48°75 || 7-5740 5°59 || 14-9807 | 28°91 4°8911 | 30°06 || 10°6920 | 59-40 || 12-:0444 | 56°84 || 4°5985 | 47-00 
~ 10, | 0°317 | 52:0 | 7°5490 5:25 || 15-0822 | 29°36 4-8908 | 30:08 || 10°7090 | 59-75 || 12-0569 | 57-02 || 4°6251 | 47-94 
> 27, | 0°349 | 53°75 || 7-4674 4°09 || 15°3849 | 31:96 5:0048 | 88°06 || 10°8087 | 61-22 || 12°1069 | 57°57 || 4°6404 | 48°40 
May 2, | 0°426 | 56°75 || 7°4265 3°52 || 15-3912 | 32-42 5:0318 | 38°80 || 10°8165 | 61:42 || 12-0893 | 57-41 || 4:6644 | 49-06 
59 9, | 0°425 | 61:5 || 7°3035 1:85 || 15-4033 | 32°55 || 4°9888 | 32°59 || 10°7200 | 59-98 || 11-9824 | 56-02 || 4-6179 | 47°78 
9p 16, | 0°380 | 57-75 || 71990 0°36 || 15°38385 | 32°36 4-9043 | 30°41 || 10°5973 | 58-14 || 11-8611 | 54°45 || 45929 | 46°88 
A steady increase or a fluctuation in weight of the salts is best shown under Column W’, 
absorbed for 100 parts of each salt, and thus shows its comparative avidity for mvisture at different temperatures, and also with slight 
This gives the weight of water 
alterations in the tension of aqueous vapour. Numbers from which the formule for the hydrated salts were calculated are shown in 
Clarendon type. 
* November 27th. 
t+ November 29th, W, 8-913. 
{ No weight recorded on February 16th. 
