carefully examined macroscopically. The notes on the case made on 

 dissection and examination are as follows: 



"The nasal duct on the left side is extremely short. It passes 

 from a normally situated lachrymal sac downwards, backwards and 

 inwards and terminates by opening into the middle meatus of the 

 nose a short distance below the hiatus semilunaris (see Fig. 1). The 



opening is guarded by a lunate 

 flap of mucous membrane. The 

 duct possesses no other nasal 

 opening that can be discovered. 

 At the point in the roof of 

 the inferior meatus where the 

 opening of the duct might be 

 expected to be found there is a 

 cone-shaped recess. From the 

 deep aspect of the mucous 

 membrane lining the apex of 

 the cone a fibrous cord passes 

 upward through the normal bone 

 canal to join the inferior aspect 

 of the nasal duct a short distance 

 below the lachrymal sac." 



From the fact that the bone 

 canal was developed and that a 

 fibrous cord lay in it, it was thought that the duct might have originally 

 been normally developed and that it might have become secondarily 

 obliterated and that the existing channel might have been an artifi- 

 cially made "false" passage of accidental or deliberate origin. An 

 attempt to solve the difficulty was made by subjecting portions of the 

 tissues to microscopic examination. Four blocks were prepared. 

 The approximate positions of the tissue sections 

 examined and here described are indicated on Fig. 2 

 by the lines I, II, III, and IV. 



Fig. 2. Diagram to show the general relations of the ab- 

 normal Duct and the positions from which blocks of tissue were 

 removed for microscopic examination. 31. 31. Middle Meatus. 

 I. 31. Inferior Meatus. F. C. Fibrous Cord. I, II, III and IV 

 show positions of sections I, II, III and IV. 



Section I. Shows a duct of normal structure, the lining of ciliated 

 epithelium is well preserved in places; at others it has been rubbed 



Fig. 1. To show the position of an ab- 

 normal opening of a nasal duct into the middle 

 meatus. A bristle is in the opening. 



