272 Mr. Addison's Remarks on the Influence of Terrestrial 



would be better to express the composition of the alcoate thus 



Two atoms chloride of calcium 14* 



Seven atoms alcohol 20*125 



34-125 

 In the solution of chloride of calcium, no crystallization 

 takes place at the temperature of 50°, when the alcohol ex- 

 ceeds the proportion of 10 parts to 4 parts of the dry salt. 

 But the solution crystallizes readily when further concen- 

 trated. A solution saturated at 170°, and which consisted of 

 10 parts alcohol and 7 parts chloride of calcium, or nearly 

 the atomic proportions of the alcoate, crystallized slowly upon 

 cooling, forming crystals upon the surface of the liquid and 

 sides of the phial, of great regularity and beauty. The whole 

 crystallized during a cold night, leaving no mother-liquor 

 whatever. 



The injurious effect of the presence of water, in the forma- 

 tion of this alcoate, was evident in alcohol of the specific gra- 

 vity 0*798, in which the contaminating water did not amount 

 to 1 per cent. A solution of chloride of calcium in alcohol of 

 this strength did not crystallize readily, and the crystals even- 

 tually deposited were small and ill-formed. Chloride of cal- 

 cium does not crystallize at all in alcohol of the specific gra- 

 vity 0*827. The same inconvenience arises from employing 

 chloride of calcium containing a little water. 



Although the alcoate of chloride of calcium in a state of 

 purity is entirely decomposed at a temperature not exceeding 

 250°, yet, when water ! . present, alcohol can be retained by 

 the chloride of calcium at a much higher temperature. Thus 

 I repeatedly found, that chloride of calcium, from which al- 

 cohol had been rectified, and which afterwards had been 

 washed out of the retort by water, gave indications of the pre- 

 sence of alcohol, after being exposed on the sand-bath to a 

 heat of 400° or 500° for several hours. Transferred in a 

 crucible to the fire, after it ceased to lose weight on the sand 

 bath, alcohol-vapour was emitted, which took fire and burned. 

 [To be continued.] 



XLVIII. Remarks on the Influence of Terrestrial Radiation in 

 determining the Site of Malaria. By Wm. Addison*. 



THHE diseases arising from atmospheric impregnations have 

 -■• long formed an important topic of inquiry among medical 

 men, and are generally supposed to have an origin from some 



Communicated by the Author. 



subtile 



