1835.] RacemicAcid. 245 



15*88 grs. had been deprived of the whole of their water by 

 the heat of 350°, the anhydrous salt must have been com- 

 posed of 



Protoxide of tin . . 8*25 = 1 atom 

 Racemic acid . . . 4*684 = J atom + -ji^ atom, 

 or very nearly a diracemate of tin. From the taste of this 

 salt, and from the effect of water upon it, there seems no 

 reason to doubt that when first formed it was neutral, but 

 that nearly one half of the acid had been washed away while 

 it was on the filter. If we include the water driven off, the 

 component parts of the 20 grs. must have been 



Racemic acid . . . 5*7511 or 4*684 = J a,tom 

 Protoxide of tin . . 10*1289 „ 8*25 = 1 atom 

 Water ..... 4*1200 „ 3 355 = 3 atoms 



200000 



The preceding results not being very satisfactory, I mixed 

 together solutions of 151*25 grs. of protochloride of tin 

 crystals, and 122*5 gr. of racemate of soda. The former of 

 these salts contained very nearly 72 J grs. of protoxide of 

 tin, and the latter 82 J grs. of racemic acid. A white chalky 

 precipitate fell, which being collected on a filter, washed 

 with three successive portions of hot water, and dried, 

 weighed 119*21 grs. 



The first portion of water being evaporated to dryness,^ 

 left a salt in long needles, agglutinated together. It red- 

 dened vegetable blues, and had an astringent and bitter 

 taste. It weighed 107*9 grs. 



The second portion left a salt having a saline and slightly 

 acid taste, weighing 23 grs. 



The third portion left 8*1 grs. of a similar salt. All these 

 salts reddened vegetable blues, as was the case with the 

 chloride of tin which had been employed. 



Thus, from 273*75 grs. of the two salts employed, I ob- 

 tained, in all, 258*21 grs. of new salt. The difference must 

 have been partly owing to the new salts having been more 

 dried than the original salts had been. Accordingly, on 

 dissolving the 107*9 gr. of the salt obtained from the first 

 water employed to wash the precipitate, and crystallyzing 

 afresh, the crystals weighed 114*7grs. The additional 6*8grs. 

 thus obtained make the weight 265*01 grs. There is still a 



