. Urinary analysis and diagnosis by microscopical and chemical examination. Parasites.—Other parasites which may possibly be found in theurine are the strongylus gigas, oxyuris vermicularis, and the cercomonasurinarius. The strongylus gigas resembles the ascaris lumbricoides, al-though it is much larger, and its head contains six papilliform nodulesinstead of three. The oxyuris vermicularis is a small, thread-like forma-tion, and the cercomonas urinarius a small infusorium, which consists ofan oval, granular body, and contains a number of cilia. These parasitesare extremely rare and of no prac
. Urinary analysis and diagnosis by microscopical and chemical examination. Parasites.—Other parasites which may possibly be found in theurine are the strongylus gigas, oxyuris vermicularis, and the cercomonasurinarius. The strongylus gigas resembles the ascaris lumbricoides, al-though it is much larger, and its head contains six papilliform nodulesinstead of three. The oxyuris vermicularis is a small, thread-like forma-tion, and the cercomonas urinarius a small infusorium, which consists ofan oval, granular body, and contains a number of cilia. These parasitesare extremely rare and of no practical importance. CHAPTER XV. EXTRANEOUS MATTERS. Extraneous matters are common occurrences in urinary sediments,and must be well known, as they might frequently lead to errors in diag-nosis. Their presence in the sediment may be due to many causes, suchas exposure to air, from which various objects may fall into the urine,pouring the urine into bottles which are not perfectly clean, the use ofsalves or dusting-powders for the genital organs, or admixture of particles. Fig. 88.—Cotton Fibres (X 500). from the faeces. Many of these formations are characteristic enough, butothers may closely resemble various features of normal or pathologicalurine, from which they must be carefully differentiated. The different fibres of cotton, linen, silk, and wool are frequentlyfound in the urine. Cotton Fibres (see Fig. 88).—Cotton fibres are coarse, somewhat wavyand twisted. They are highly refractive, their edges being more compactthan the centre. The central portion may appear slightly folded, and 166 EXTRANEOUS MATTERS. 167 often shows irregular markings. When the fibres are very small thediagnosis must be made from the wavy, compact appearance. Linen Fibres (see Fig. 89).—Linen fibres are variously sized, some-times broad, and at other times narrow. They are composed of smaller
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