98 



CONCLUDING EEMAEKS. 



in different years and different localities the proportions in whicl 

 the constituents of ergot occur present certain variations. 



If, on the other hand, an approximate analysis is not required, 

 but in its stead a fairly accurate comparison of specimens gathered 

 in different fields, then it must be borne in mind that only certain 

 practically valuable constituents have to be taken into account, for 

 the estimation of which more accurate methods may not unfre- 

 quently be devised. This we are generally able to accomplish, 

 for we are in a position to elaborate the necessary mode of treat- 

 ment, to determine the extent of the errors involved, and the 

 corrections to be made for them, and to make several estimations 

 from the same material from which a mean may be calculated. 





