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cool, a quantity of hydrochloric acid is to be added, and after standing for six or seven hours, the precipitate is collected on a filter. This impure hippuric acid is to be dissolved in water, and decolorized by boiling with animal charcoal. It is necessary to operate upon the Urine when perfectly fresh, as the hippuric acid soon becomes decomposed into benzoic acid.

The hippurate of lime was made by dissolving hippuric acid in lime water and filtering. Carbonic acid was passed through the filtrate, which was again filtered. The solution was concentrated that crystals might form.

Allantoin. The crystals of allantoin were made as follows: crystals of uric acid were suspended in a little water; the mixture was heated nearly to the boiling point, and, finally, powdered peroxide of lead added in small quantities as long as its color disappeared. The mixture was filtered while hot, and the crystals were obtained as the solution cooled. Urea remained in the mother liquor. The crystals were purified by re-crystallization.

Murexid. Carbonate of ammonia was added to a warm solution of alloxan and alloxantin. The murexid separated in its characteristic dark red crystals as the solution became cool.

Thionurate of ammonia. A cold, strong solution of alloxan was mixed with a solution of sulphurous acid in water, until the smell of the latter ceased to disappear after agitation. The fluid was then supersaturated with carbonate of ammonia, and kept boiling for nearly half an hour. Upon cooling, the salt crystallized in considerable quantity.

Thionuric acid. A solution of thionurate of ammonia in hot water was precipitated by acetate of lead. The precipitate was suspended in water, and decomposed by sulphuretted hydrogen. The sulphuret was separated by filtration, and the clear solution yielded crystals on evaporation.

PLATE VIII.

ALLOXANIC ACID, C,H,N,010- OXALURIC ACID, CH,N,Og.

OXALURATE OF AMMONIA, NH,CH,1,0g. OXALURATE OF LIME, CH,N,CaOg + Aq.(?) OXALURATE OF MAGNESIA, CH,N,Mg0s + Aq. (?) URAMILE, C,H,N.06.

Fig. 1. Alloxanic acid.

Fig. 2. Oxaluric acid.

Fig. 3. Oxalurate of ammonia.

Fig. 4. Oxalurate of lime.

Fig. 5. Oxalurate of magnesia.

Fig. 6. Uramile.

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Fig. 6.

Fig. 5.

x 213

X 180

1x42.

100ths. 1000 thos.lt 1000 ths.

1x130

Path. I ab. 1857 Harrison 3 Sons, Lith. St. Martin's Lane

4x218

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