Essentials of practice of medicine : arranged in the form of questions and answers, prepared especially for students of medicine . he red corpuscles in the blood leav-ing the diffusible haemoglobin in solution therein which is secretedby the kidneys. The solution of the corpuscular clement is noted incertain diseases, as in scurvy, typhus, pernicious malaria ; also as theeffect of certain poisons, such as hydrogen arsenide, phosphorus,carbolic acid, and by pressure ; a periodical form is observed, thecause of which has as yet not been ascertained. llAvMATIKIA AND tLEMOGLOBINt I! IA. 43 By whic
Essentials of practice of medicine : arranged in the form of questions and answers, prepared especially for students of medicine . he red corpuscles in the blood leav-ing the diffusible haemoglobin in solution therein which is secretedby the kidneys. The solution of the corpuscular clement is noted incertain diseases, as in scurvy, typhus, pernicious malaria ; also as theeffect of certain poisons, such as hydrogen arsenide, phosphorus,carbolic acid, and by pressure ; a periodical form is observed, thecause of which has as yet not been ascertained. llAvMATIKIA AND tLEMOGLOBINt I! IA. 43 By which simple test may the presence of haemoglobin in thsurine be demonstrated ? By slightly acidulating some of the urine in a test tube with aceticacid and raising it to the boiling point. As haemoglobin containscoagulable albumin, this will coagulate, and will, on subsiding, befound as a reddish sediment at the bottom, the soluble haemoglobinhaving changed to insoluble haematin. How can the haemoglobin of the urine be demonstrated bythe spectroscope ? By placing it in the light entering the prism of a spectroscope, it Fig. Teiebmanns Hrtmin Crystals. will give rise to two dark absorption bands in D and E of the spec-trum, , in the yellow and in the green, the former being narrower,the latter broader. Which is the chemical test for haemoglobin ? Almens test: Add a few drops fresh tincture of guaiac to thespecimen of urine contained in a test tube ; after agitation add a fewdrops of old spirit of turpentine of ozonic ether (ethereal solution olhydrogen peroxide); if haemoglobin is present, the color will changeto a distinct blue. 44 EXAMINATION OF I RINE. In which manner may the presence of haemoglobin be mostdefinitely and positively established? By the production of Teichmanns crystals of baematin hydro-chloride, often termed haemin. To this cud the slightly acidulate Iurine is boiled, and the eoagulum filtered off; a small portion of thisis dried with a gentle heat on a
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