No. 7. DEPARTMENT OF AGRICULTURE. 188 



they may in some cases be able to give the farmer some hint which 

 may save the life of a valuable animal. There may be some little 

 things which I may not think of, and which I would thank you all 

 to ask me about when we come to that point. 



(The Doctor had, before beginning his lecture, hung upon the 

 wall two models or charts, one representing in detail a horse the 

 other a cow.) 



These two models which I have hung upon the wall you will rec- 

 ognize ais models of the horse and the cow. Let us for a few 

 moments consider them as two machines, created for the use of the 

 agriculturist, machines without which agriculture could not exist. 

 To some perhaps this may seem a little overdrawn, but I will go a 

 step further and say, machines without which civilization could not 

 exist. 



We all know that with every kind of machinery, there are cer- 

 tain rules to be followed. While there are a great many different 

 kinds of machines, all have a certain motive power, depending 

 largely upon their construction and the purpose for which they 

 are designed. One may have a lever here to move to the right, an- 

 other may move to the left. One may require steam and another 

 may require the explosion of gasoline or some other substance to 

 set the wheel in motion, but all tend to the same end, namely, to 

 produce power whereby the machine may do the work for which 

 it is designed. 



The man who is successful in manipulating this machine must 

 know all the intricate parts. He must know what particular kind 

 of fuel will produce the most power. He must know how much 

 fuel to use and when to use it. He must know that all parts are 

 properly adjusted and that the important bearings are properly 

 lubricated. He must know the limit of speed at which his machine 

 may run without danger of explosion or injury, 



(Referring to the model of the cow.) In this picture we have the 

 bones of the animal exposed and you will see here the large number 

 of levers— we will call them levers, bones or levers that are designed 

 to work this great machine which is here represented. 



Here we have a representation of the circulation of the blood and 

 the nervous system, showing you how all these veins and arteries 

 are arranged. The blue lines represent the veins and the red lines 

 the arterial circulation, as it is thrown away from the heart. In 

 here you will notice the glands (pointing to the part indicated on 

 model.) Here we have the sub-maxillary gland which is so often 

 diseased with tuberculosis. Pardon me, but I cannot help bring- 

 ing in that subject of tuberculosis once in a while, because it is 

 something I am very much interested in, and all farmers should 

 be. The gland as represented here is supposed to be in the natural 

 condition, although perhaps a little overdrawn down here (indicat- 

 ing). 



Here we have another division. In this we have removed the 

 skin only. This part comes next to the skin and shows the nervous 

 circulation. Here we have the spinal column, looking at it from 

 the front and running all through. All these little white lines are 

 •nerves. People sometimes say that the cow has no nerves. Just 

 look at that and see if you think there are no nerves in that cow. 

 No man of any fiejjsibility can look at that and then go home and 



