proposed for extiiigu'ishbg Flies. : ^53 



the portion of the unfrozen soluiioii, presented as fol- 

 lows : 



In a flask containing; 3f5 granirnes of pure water^ the water 

 produced by the melting of the crystals No. 1 weighed 3(5 

 grammes 5 decigrammes ; and the water not frozen, and 

 carefully separated from ihe ice, weighed 36 grammes 6 de- 

 ciorammes. 



In the san)e flask, the water proceeding from the mcUing 

 of the crystals No. 1 weighed 39 grammes dccigranmies ; 

 and the water not frozen weighed 3y grammes 8 deci- 

 grammes. 



Although the results thus presented are not all necessary 

 for answering the proposed question, we have thought it 

 nroper to report them all, in consequence of their appear- 

 ine in opposition in some respects to the ideas hitherto en- 

 tertained as to the freezing of salt water, and as they serve 

 to clear up the processes followed in souio northern districts 

 for the extraelioii of salt from sea water, and perhaps 

 tend to review and verify the theoretical principles of Ireez- 

 ina;. 



The second question remaining to he exansined, respects 

 the injury thai may be done to leather pipes by sak water. 



In order to decide this question, thev thought ilbest to be 

 guided both by experiments and observation. They were 

 informed by M. Bonjour, the director of the national salt 

 works, that in the salt works of Meurthe they have for se- 

 veral centuries used, for raising the salt water, punsps in tlie 

 cvlinders of which round pieces of leather have been fixed ; 

 and that notwithstanding the uninterrupted usage of these 

 pump:^, and the contact of water saturated at IC detrrees, no 

 alteraiiou nor dcterior.uion had taken place which cindd be 

 attributed to the action of this liquid. 



But even if it were true, that the saturated solution of salt 

 attnelced the leather or rendered it brittle, yet we do not 

 think salt water should be rejected on that account^ because 

 M. Six with justice observes, that in the present ^tate of the 

 service they carefully wash the fire pumps arul their pipes as 

 xuou as they have b(x-n used, in order to clear them from 



anv 



