66 



BACTERIOLOGICAL METHODS 



As already indicated the number of organisms in food sub- 

 stances is in direct ratio to the following conditions : 



1. InsuflScient culling of partially and wholly decomposed fruits. 



2. Unsanitary factory conditions and unsuitable methods. 



Ova Of the Pexrasitic Worms or Man 

 TREMATODA 



DRAWN 



ro scALc X leoo 



Heterophyes 

 heterophyes 



(D.flcrLou8.l9(u)jak 



Dicro- „ 

 coelium" 

 lOLnceatum 



I'l 



Opisthorcliis 

 felineus (ojicrtoowi^as) 



I § 



(M...oo..«o5, Fe^sclola rasciolopsis 



i.hPJiB-^}^^ buskii (.«.L...„.) 



Clonorchis Clonorchis 

 sinensis endemicus 



(Modii r 1 I. .,,11 l.ooas lyo/) 



QnW«*«V7 Schistosoma pf.rartonimus''^^?'"'^"^' K|£i/''' 





'' nians6nl(N«S^ 



USA ai'al Medica/ScJMOl. 



Fig. 2o. — Intestinal ova. Trematodes. Ova of intestinal parasites may possibly 

 occur in foods of vegetable origin contaminated by soil, sewage and fecal matter. 

 Note comparative size and the actual measurements according to the scale. It may 

 be mentioned that the extremely small seeds of Vanilla planifolia have been mistaken 

 for ova of intestinal parasites. — (Stitt.) 



We are warranted in establishing a maximum limit as to the 

 number of organisms permissible in food substances. The 

 method of estimating the quality of foods based upon the number 

 of micro-organisms present has been tested out in diiiferent coun- 

 tries and has proven very reliable and satisfactory; and those who 



