. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. ORGANIC ANALYSIS. 813 This specimen of healthy saliva therefore contained, Water ("Fatty and odorous matter Alcoholic extract and salts Mucus and epithe- lium Ptyalin, watery ex- ^ tract, salts and > traces of mucus j Organic matter, Fixed salts, If mercury were sought for, the best plan would be to mix a little nitric acid with the sa- liva, evaporate to dryness, mingle the dry mass with well-dried carbonate of soda, to place the mixture in a fine glass tube sealed
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. ORGANIC ANALYSIS. 813 This specimen of healthy saliva therefore contained, Water ("Fatty and odorous matter Alcoholic extract and salts Mucus and epithe- lium Ptyalin, watery ex- ^ tract, salts and > traces of mucus j Organic matter, Fixed salts, If mercury were sought for, the best plan would be to mix a little nitric acid with the sa- liva, evaporate to dryness, mingle the dry mass with well-dried carbonate of soda, to place the mixture in a fine glass tube sealed at one end, and apply the heat of a spirit lamp. If the metal were there, it would sublime and condense as a dew of metallic globules on the cool part of the tube. II.—ULTIMATE ANALYSIS. Organic bodies consist principally of carbon, hydrogen, oxygen, and nitrogen, with occa- sionally small quantities of sulphur, phos- phorus, and various metallic, earthy, and saline matters in minute proportions. In cases where the four first elements only are present, the analysis is comparatively easy; and if, as some- times occurs, the substance to be analysed is capable of assuming a crystalline form, its purification is a matter of little difficulty. When, however, saline compounds enter es- sentially into its constitution, as in most animal principles, crystallization is never found to take place. This general absence of crystalline form in animal principles, and the consequent difficulty of ascertaining that they are free from all mois- ture, which does not chemically enter into their constitution, have, by rendering us uncertain of the purity of the substances analysed, mainly contributed to the slow and uncertain progress of this department of chemistry, and have given rise to the numerous contradictory statements with which it abounds. By multiplied researches and experiments we are, how- ever, at length arriving at results on the accuracy of which tolerable confidence may be place
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