VEGETABLE CELLS. 



399 



ovoidal transparent nucleated cells, represented in the accompanying 

 fig. 186, and showing its stages of growth as first observed by Turpin, 



fig. 186. The growth of the Yeast Plant. 



who carefully watched the changes after mixing it with some newly- 

 made beer. Fresh yeast has the appearance seen at No. 1 ; one hour 

 after it had been added to the wort, germination commenced, and 

 produced two buds or cells, as at No. 2. In three hours they were 

 doubled, as at No. 3, and attained the size of the maternal cell. In 

 eight hours the plants began to ramify, as at No. 4, and some to 

 explode, emitting a fine powder; and in three days jointed filaments 

 with lateral branches were produced, as at No. 5. 



Yeast-cells occasionally form in the human body under certain 

 states of disease, principally occurring in the urine of patients ; hence 

 the cell has been named Torula diabetica : for the sake of comparison 

 a few of those cells, highly magnified, are represented at No. 9, fig. 187. 

 Mr. Busk met with a peculiar disease of the stomach, in some patients 

 under his care vomiting another form of this remarkable fungi, named 

 by Professor Goodsir Sarcina ventriculi ; this presented under the 

 microscope an appearance very nearly resembling the Gonium pectorcde 

 represented in fig. 95. Dr. John Ogle tells us that he has met with 

 Sarcina where disease was never previously suspected to exist, averag- 

 ing one out of every five or six stomachs examined. Are not these 

 Sarcina taken into the stomach with impure water ? 



The Mycoderma cervisia of Desmaziers is another stage of growth 

 of the same plant deposited in porter-vats. Its various stages are 

 shown in fig. 187, Nos. 6, 7, and at 8 ; the perfect plant is seen, with 



