40O 



STARCHES AND FIBRES IN URINE 



but the present view is that they are only ordinary casts which have 

 been retained in the renal tubules for a long time. Even amyloid 

 kidney does not produce any distinctive cast. 



Cylindroids are drawn-out bodies showing tapering ends, irregularity of diameter 

 and longitudinal striations. 



It will be found that a ^ in. objective gives almost all the information required 

 as to casts. It is quicker and gives more positive information. 



Mounting a sediment in Gram's solution or tinging it with the merest trace of 

 neutral red is of much assistance. 



FIG. no. Fibres, starch granules, etc., which may be found in urine sediment. 

 No. 12 gives appearance under microscope of scratches on old used glass slides. 

 No. 1 5 (a) , Tyroglyphus longior, a mite. No. 1 5 (b) , Trichomonas vaginalis. No. 1 6 (a) , 

 Egg of Eustrongylus; (6), Echinococcus hooklets', (c), Schislosoma egg; and (d), 

 Filaria bancrofti embryo. 



Starches and Fibres. In examining urinary sediments it is important to be fa- 

 miliar with the various textile fibres and starch grains which are so frequently present, 

 the fibres coming from the clothing and the starch grains from dusting powders. 

 Wool fibre fragments show bark or scale-like imbrications and are round. Cotton 

 fibres are flattened and twisted, while linen ones show a striated flattened fibre with 

 frayed segments as of a cane stalk. Silk shows a glass-like tube with mashed in ends. 



Corn and rice grains are the most common of the starch grains and their nature is 

 immediately disclosed by their blue color when mounted in iodine. 



