Agricultural Education — Examination Papers, 1880. cvii 
2. State liow tlae heart mechauically assists iu passage of the 
blood as the central organ of the circulation. 
3. Name the changes which take place in the blood in the systemic 
and pulmonic circulation, and say how arteries are to be dis- 
tinguished from veins. 
4. Name the blood vessels which exist in the Foetal Calf which do 
not act as carriers of blood after birth, and state the reason of their 
presence in the foetus, and their subsequent obliteration. 
5. By what means is the birth of a foetus effected, and in what 
respect do throes differ from ordinary muscular contractions ? 
6. Give an example of a voluntary and an Involuntary Muscle, and 
state the differences to be observed on a microscopic examination of 
the fibres of each. 
