8 J. PARSONS SCHAEFFER 



of the nasolacrimal passages. In this respect I am in accord with 

 Born, Legal and others and at variance with Ewetzky's first 

 paper ('79). As to age for the first evidences of the anlage of the 

 nasolacrimal passages I agree rather closely with Ewetzky, who 



Fossa era n >i 

 anterior <• 



% 



% 



fe» 



■XV 



Meatus nasi 

 inferior 



mm 



Ifi 



■y« 



Con. nas. 

 inferior 



•\ Hep. nasi .-SI 



t% 



Fig. 5 Selected sections from a series through the developing nasolacrimal 

 passages (human embryo aged from forty-three to forty-five days). Note that 

 nowhere are the anlages of the nasolacrimal passages in connection with the sur- 

 face. The lacrimal duds are already in evidence. All of the 'passages' are yet 

 solid cords of epithelial cells, and are indicated in deep black. X 1-4. 



found that "die Entwickelung des Thranencanals beginnt um 

 das Ende der 5. oder im Anfang der 6. Woche des Fotallebens." 



The anlage of the nasolacrimal passages soon becomes suffi- 

 ciently developed to sink into the corium along the course of 

 the rudimentary naso-optic fissure. The anlage grows rapidly 



