and Attached Water. 



269 



according to the analyses given above. The letters M.L show 

 that the liquids here analyzed stood before solidification in the 

 relationship of mother-liquors to the preceding crops of cryohy- 

 drate. In column 6 are analyses of the crop of cryohydrate 

 immediately preceding the last cryohydrate. The salts are 

 arranged according to the degree of cold attainable when the 

 salt is used as a cryogen, i. e. in a freezing-mixture. 



Table X. — Showing (1) the chemical formula of the salt, (2) the 

 lowest temperature to be got by mixing the salt with ice, 

 (3) temperature of solidification of the cryohydrate, (4) mo- 

 lecular ratio between anhydrous salt and water of its cryohy- 

 drate (water-worth or aquavalent), (5) percentage of anhy- 

 drous salt in portion of cryohydrate last to solidify, (6) per- 

 centage of anhydrous salt in crop of cryohydrate before the last. 



0) 



Formula of salt. 



NaBr 



NH 4 I... 



Nal 



KI . 



NaCl 



SrCl 2 +6H o ... 



NH 4 2 S0 4 



NH 4 Br 



NH 4 N0 3 



NaN0 3 



NH 4 C1 



KBr 



KC1 



K 2 Cr0 4 



BaCl 2 +2H 2 ... 



Sr 2 N0 3 



MgS0 4 +7H 2 0... 

 ZnS0 4 +7H 2 0... 



KN0 3 



Na„CO, 



CuS0 4 +5H 2 ... 

 FeS0 4 + 7H o ... 



k 2 so 4 ....: 



K 2 Cr 2 7 



Ba2N0 3 



Na 2 SO 4 +10H.,O 



KC10 3 ".... 



A1 2 NH 4 2S0 4 +12II 2 

 HgCl 2 



(2) 



(3) 



(4) 



(5) 



(6) 



Tempera- 

 ture of 

 cryogen. 



Tempera- 

 ture of soli- 

 dification of 

 cryohy- 

 drate. 



Molecular 

 ratio or 

 water-worth 

 or aquava- 

 lent. 



Percentage 

 of anhy- 

 drous salt 

 in last cryo- 

 hydrate. 

 M.L. 



Percentage 

 of anhy- 

 drous salt 

 in next to 

 last cryo- 

 hydrate. 



-2§ 



o 

 -24 



8-1 



41-33 



4161 



-27 



-275 



6-4 



55-49 



576 



-26 5 



-15 



5-8 



59-45 



59-39 



-22 



-22 



8-5 



5207 



5172 



-22 



-22 



105 



23-60 





-18 



-17 



229 



27-57 



27-5 



-17 5 



-17 



10-2 



4170 



42-2 



-17 



-17 



111 



3212 



3217 



-17 



-172 



5 72 



4371 



43-26 



-16 5 



-175 



813 



40-80 



413 



-16 



-15 



12-4 



19-27 



19-27 



-13 



-13 



1394 



3215 



31-80 



-10-5 



— 1 14 



16-61 



2003 



2007 



-10-2 



-12 



18-8 



36-27 



36-41 



- 72 



- 8 



87-8 



23-2 



240 



- 6 



- 6 



33-5 



25-99 



25-91 



- 5 3 



- 5 



238 



21-86 





- 5 



- 7 



20 



30-81 





- 3 



- 2-6 



44-6 



11 20 





- 2 2 



- 2 



92-75 



5-97 





- 2 



- 2 



437 



16-89 





- 17 



_ 2 2 



41-41 



16-92 



1735 



- 15 



- 1-2 



114-2 



7 80 



75 



_ l 



- 1 



2920 



5 30 





- 09 



- 0-8 



2590 



5-30 





- 07 



- 07 



165-6 



4-55 





- 07 



- 5 



2220 



293 



2-88 



! - 0-4 



- 2 



261-4 



4-7 



4-2 



- 2 



- 2 



4500 



324 



3 29 



