THE 



Ohio Journal of Science 



PUBLISHED BY THE 



Ohio State University Scientific Society 

 Volume XVII APRIL, 191,7 No. 6 



TABLE OF CONTENTS 



FORMAN AND Reed — Tuniors in Dogs 177 



FoERSTE— Notes on Silurian Fossils from Ohio and Other Central States. . . . 187 



Williams— Scientific Drawing in Biology 205 



Drake — New and Noteworthy Tingidie from the United States 213 



News and Notes 216 



TUMORS IN DOGS. 



Jonathan Forman and Carlos I. Reed. 



I. Carcinomas of the Thyroid Gland. 



This paper embraces the anatomical description of fifteen 

 enlargements of the thyroid glands of dogs and an attempt to 

 correlate these with well known types of thyroid carcinoma in 

 the human as well as with the general principles of oncology. 



The frequent occurrence of tumors among vertebrates is 

 well recognized. Numerous workers have reported the occur- 

 rence of malignant new-growths in both wild and domestic 

 animals. Cancer has been found more frequently among the 

 domesticated animals. The incidence curve of malignancy in 

 dogs approaches that of the human. 



In his discussion of the frequency of cancer in dogs, Wolff 

 ('13) cites,, one series of dogs reported from the Berlin vet- 

 erinary clinic in which 1.9% of all sick dogs exhibited some 

 form of malignanc3^ In another series, the incidence was 3%, 

 while in a third series there was an incidence of 5.5%; a fourth 

 series showed an incidence of 7% and a fifth series showed a 

 malignancy incidence of 8%. From these data it was also 

 shown that the greatest incidence of cancer among dogs occurs 

 at about the eighth year of life. Goodpasture and Wislocki ('16), 



i77 



