DIRECT EXAMINATION 



67 



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 Pevrasltic Worms of Man 

 CESTODA 



draWim to scale X leoo 



Te^enia .„. . -^„ ^ 



solium DiDlo^*^^-^ Dibothrio- „ . . 



*°"" '-"■""' R cephoilus Hymenolepisneina 



©*^c5mndis \e£uS(.,.«.^^) (vr,e.R„.™.^s,n„„..) 

 ^'™'""' ,^???XHymenolepis 



N''^~.\ #'^^' \\\ diminuta ^ 



sadlnata , 



c oininum („ft»siii., mm) 



Cestode seoments 



DRAWN TO SCALE X lO W 



M\ ^^^^^^.^SP^"^*^ Hymeho- 



*^* J lepls 



1 diminuta. 



'■ Kk^iUim mww' fm. M (Modified ^raaillIe«J90<j) ,^. 



Tbenia Dipylidium ^.^_T^~~^S , , H.nanaTBenia 

 solium caninum Dibothnocephalus lotus saginoia 



^jtvtn/iw USA^aya/Medlc'aJSc/ioa/. 



Fig. 21. — 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 



