61 

 ANIMAL MEAL. 



The presence of animal meal or tankage can be easily confirmed 

 by clearing a portion of the suspected substance by means of chloral 

 hydrate and obser\ang the characteristic striated muscle fibre, 

 which is always present in abundance. The characteristic odor 

 of animal meal also helps a great deal in its diagnosis. 



ANALYTICAL KEY TO SOME COMMONLY OCCURRING 



STARCHES. 



The key which follows is not entirely original with the author; 

 it is more a compilation of the keys found in Winton's "Micro- 

 scopy of Vegetable Foods," Leach's "Food Inspection and 

 Analysis" and Moeller's "Mikroskopie der Nahrung-und Gen- 

 ussmittel", but as all these books are not usually available it has 

 been thought advisable to prepare a key which shall be brief, ac- 

 curate and contain the salient points of difference in the starches. 

 The author has differed in a few instances from the results 

 of other investigators, but only after the closest examination into 

 the points of difference. 



The first principal difference in starches being their shape, 

 they have been classed in this key under five general heads, viz., 

 polygonal, spherical, circular, ellipsoidal and irregular grains, 

 the last class containing all those starches which do not fall strict- 

 ly under the head of the four former divisions. The starches 

 under each division are then arranged according to their descend- 

 ing sizes, and under these their particular characteristics are 

 given. 



This table is of use principally to those who are more or less 

 familiar with the microscopical appearance of the starches, for 

 as its name implies, it is simply an anal>i:ical key for their recog- 

 nition. 



The measurements have been given in microns (^t) instead of 

 decimal parts of a millimeter, it being more common to use this 

 unit of measurement in this connection. A /x equals 1-1000 

 millimeter or 0.001. 



