DIRECT EXAMINATION 



6 7 



are entrusted with the enforcement of the laws governing the 

 physical well-being of the people are most emphatically in the 

 right when they insist that the sanitation in and about our 

 factories should be of a high order. 



In addition to the purely quantitative estimates of micro- 

 organisms based upon direct examination, the analyst is enabled 



Ova or the Parasitic Worms or Man 



CESTODA 



soliuin 



ilo-^*^ Dibothrio-^^ 



JonoooitJS cephalus nymenolepis na. 



> /-<Y-NVHic 1?\tTI?, ,~\ ^nrRiom.ftxst.u-. 190,9 



A> A ranui s icxt u^ (* toow.^ 



C-B 7 : ' : llyrnenolepis 



TeeniaW ^ s, diminuta 



sadinata 



Dipylidium 

 WM caninuni^fu.su^MW)) >^ 



Cestode sepments 



J^* 1 * '' DRAWN TO SCALE X 10 W 



\^M4L> 10 MILLIMITCRS 



Davainea 





Tbenia Dipylidium 

 sohum caninum Dibothriocephalus latus 



FIG. 2 1 .Intestinal ova. Cestodes. (Stitt.) 



to form certain opinions and conclusions regarding the source of 

 the contamination. For example, the hyphal development in 

 mold infested fruit is in marked contrast to the hyphal develop- 

 ment in the fruit pulp, due to unsanitary factory conditions. 

 This difference in hyphal structure is due to a difference in the 

 amount of oxygen (air) supply, of moisture, of light and the 

 6 



