MICROSCOPICAL DIAGN 





(page 59), which is too long, however, for aixplanation in this con- 



nection. In specimens which have been su 

 degree of dry heat, there appears a black 1 

 over the nucleus. The heat evaporates the 

 and there must be a shrinkage on the surfac 

 evaporation. This is the greatest over t 



greatest moisture. The grains are round, <|ite, irregularly oval, or 

 egg-shaped, nearly transparent ; nucleus 



pcted to even a slight 

 | or star-shaped mark 

 oisture from the grain, 

 to correspond with the 

 nucleus where is the 



smaller end of the 

 distinct rings or laminae. 



Eccentric and in the 

 grain, and su4unded by numerous 

 The grains are w irregular in size ; the 



Fig. jo. Potato Starch, rj/j*. 



smallest are just perceptible, and the largesdre frequently ^fa of an 

 inch in length. A very decided cross is sen when viewed with 

 polarized light, the arms of the cross radiat* from the nucleus, not 

 from the centre of the grain. This is the (heapest and the most 

 common starch ; there being from $800, ojp to $1,200,000 worth 

 thrown on the market annually. Probably ti greatest part is used 

 for adulterations. 



Arrow-root Starch closely resembles poito-starch. The grains 

 are much more uniform in size than thos of the potato, and are 

 about -g-J-0- of an inch in length. The nuclus is generally in the 

 larger end of the grain, while in the potat-starch, as before men- 

 tioned, it is in the smaller end ; while the rigs are finer and more 



