184 THE MICROSCOPIST. 



acid. The latter rises in the tube and displaces the liquid. If 

 no sugar be present, no fermentation will take place, and no 

 gas will be formed in the tube. 



Test from the Growth of the Torula. During the process of 

 the vinous fermentation of a liquid containing sugar, a delicate 

 white scum collects on the surface, which when examined with 

 a magnifying power of four or five hundred diameters, will be 

 found to consist of small, oval vesicles, a, Fig. 58, which, in 



Fig. 58. 



O 







i> & 



% 

 * > fo % . 











ir*a 



% 



the course of a few hours, rapidly change their form, becoming 

 longer and more tubular, and give rise to new vesicles, which 

 shoot out from the parent body, forming an irregular jointed 

 confervoid stem, 6. These again break up into a great num- 

 ber of oval vesicles, which separate, and fall to the bottom, 

 where they may be detected by the microscope. 



The following tables for facilitating the examination of 

 urine and urinary deposits, are modified from Bowman's Me- 

 dical Chemistry. The reader may also consult the Manuals of 

 Drs. Golding Bird, Griffith, Markwick, and Rees. The works 

 of the latter three gentlemen have been published in Philadel- 

 phia, in one convenient volume. The "Analysis" of Dr. Rees 

 contains also a valuable essay on the treatment of urinary dis- 



