66 LABORATORY WORK. 



(17) Are there cavities inside the brain? 



(18) Is there a peritoneal cavity? 



(19) In what way is the alimentary canal supported? 



(20) Do you find in each form liver, spleen, and pan- 

 creas? 



(21) In what part of the cavity do you find the kidneys? 



(22) What cavity surrounds the heart? 



(23) What chambers do you find in the heart? 



(24) Is the heart dorsal or ventral to alimentary canal? 



(25) Is the aorta dorsal or ventral to alimentary canal? 



(26) What vessels carry blood to the head? 



(27) Are the respiratory organs connected, either di- 

 rectly or indirectly, with the alimentary canal? 



(28) Are any parts (if so, what) repeated one after an- 

 other in the body? 



(29) Draw a diagram of a transverse section through the 

 body in the region of the heart, showing the heart, spinal 

 cord, oesophagus, vertebra, aorta, and body-walls. 



(30) Draw a similar section through the kidneys, show- 

 ing the peritoneal cavity, intestine, mesentery, spinal cord, 

 kidneys, aorta, vertebra, etc., and the body-walls. 



Read the whole account of the Vertebrata (pp. 290 to 

 392), re-reading those parts already read. 



