340 THE AMERICAN MONTHLY [Oct. 



" Nos. 7 and 8. You call the same, and they were 

 much alike even to roan color. 



" No. 9. You say, ' not a typical case ;' it was not, there 

 being only a very few small nodules in the lungs, but a 

 large abscess in the udder. 



" No. 10 You call 'tuberculous' and she was worse 

 than I expected. 



" Your 'pretubercular' cases were not as bad as your 

 tubercular. You are right on the doul)tfal ones. 



Yours truly, Austin Peters. 



Case it. Heifer pronounced to be badly tuberculous. 

 I could find nothing abnormal, nor did the post mortem- 

 ists. 



There were other cases all like the above. When the 

 great difficulty of the physical exploration of the thoraces. 

 of the kine is kept in mind, it is a wonder that there were 

 no more mistakes made. 



For example, one old cow who had wheezy l>reatli, did 

 not furnish any sign of tuberculosis by blood examina- 

 tion, and after death her lesion was proved to bt; a (con- 

 tracted trachea from traumatism. 



The writer acknowledges his indebtedness to the 

 kindness of the veterinary surgeons, and thanks them for 

 their courtesy. 



III. COMPARISON WITH TUBERCULOUS BLOOD IN MANKIND. 



a. Morphology of the Blood in Health in Man. After 



Salisbury. 



Blood from Capillaries. Color ; bright, fresh, clear, 

 ruddy, strong. Clotting rapid and firm: Red corpuscles 

 arrange themselves in nummulations, or are scattered 

 evenly over the field. Normal in size. Non-adhesive. 

 Central depression well marked on both sides; periphery 

 well rounded, clean cut. Hold coloring matter firmly. 

 Pass readily to and fro through the fibrin filaments. 



