MORPHOLOGY. 67 



mark that Mandl has examined with attention their 

 tissues, and has been struck with the regularity of then- 

 disposition. The scales on the surface of fish, of ser- 

 pents, lizards, etc., the feathers of birds, etc., etc., are 

 all stated as being spirally disposed round a more or 

 less compressed cylinder, the axis of which runs through 

 the middle of the body. To the article of Mandl on 

 the spiral disposition of the tegumentary appendages 

 of animals, to be found in the 9th Vol. of 2nd series of 

 the Annales des Sciences Naturelles, the reader is re- 

 ferred. 



