REMARKS ON THE VALUE OF RADIOGRAPHS 

 AS ZOOLOGICAL ILLUSTRATIONS. 



By C. H. TOWNSEND. 



ILLUSTRATED WITH RADIOGRAPHS BY DR. HENRY G. PIFFARD. 



A 



P'EW months ago the 

 writer was presented 

 with some X-ray photographs 

 of sea-shells, made by Dr. 

 Henry G. Piffard, of New 

 York. The pictures revealed 

 some points in the structure 

 of shells so clearly that it 

 seemed desirable to secure 

 similar photographs of other 

 animal forms. These Dr. Pif- 

 fard very kindly offered to 

 make, and a nimiber of fishes, 

 salamanders, and other aquatic 

 vertebrates were supplied from 

 the New York Aquarium. 



The resulting radiographs 

 were so admirably made and 

 satisfactory from the natural 

 history point of view that a 

 few of them are presented 

 herewith as suggestive of the 

 value of a series of radiographs 

 for purposes of zoological 

 illustration. 



The series at hand is not 

 sufficiently large to afford 

 much data for comparison, 

 but many of the radiographs are of considerable value. Those 

 of the fishes, for instance, would be useful in a general work 



SEA HORSE, 

 HIPPOCAMPUS HUDSONIUS. 



