CHK.MK \L 11ASIS (>F TIIK ANIMAL 1;<>1>Y. 183 



it from xanthiii and hypoxanthin. It unites with acids, alkalis, 

 and salt- t> form crystallisalde compounds. Of its compounds 

 with acids the most characteristic aiv tho-e with hydrochloiie and 

 nitric acids. 



The compound with nitrate of silver is extremely insoluble in 

 1 Milling nitric acid. 



' <;i VMN IM DKOCIII.ORinK 



Fio. 30. GUANIX SITI: MI. 



ii.. _;. i < \ > i > M i i MI' 'v it i. n i ir. , * tu. uv. \jt .\ -> i > .> i i K \ i r. , 



( I! N,<). HC1 - I LI i. ( After Kiihne.) C 6 II 6 N 6 <> HNO,+ 4HjO. (After Kulnu- ) 



Reactions. By treatment with nitric acid and caustic soda 

 (Strecker's test) it yields a colouration closely resembling that 

 given l.y xaiitliin, l>ut does not respond to WeideFs test (see 

 above, p. 177). 



reactions. 1 (i) A yellow crystalline precipitate n 

 the addition <f a saturated aqueous solution of picric acid t a 

 solution of guanin-hydrochloride , insoluble in cold water. 



(ii) An orange-coloured crystalline precijiitate, very insoluble 

 in water, on the addition of a concentrated solution of pota>sium 

 chroinate. (iii) rrismatic yellowish-brown cry-tals on the ad- 

 dition of a concentrated solution of feni<yanide of potassium. 

 Xanthin and hypoxanthin when similarly treated do not yield 

 the last two precipitate-. 



l'.\ treatment with nitrous acid guanin may be readily con- 

 verted into xanthin. (Cf. adenin into hypo\:int!iin b\ similar 

 l'.\ oxidation it yields guanidin Ml < (Ml p . paia- 

 banic acid (see aliove, p. 171 ) and carbonic anliydride. a decompo- 

 sition which obviously corresponds to the formula given abo\ 

 _;u; niin. 



C,H 5 N 6 0-|-3.0-|-H 2 <) = MI (Ml -hC.H.N.O. 



1 Zt.f.iJtytiol. ('/. m IM. i S. 233. 



