302 RESPIRATION AND EXCRETION 



6. Ventilating systems. 



7. Hay fever and its cure. 



8. The comparative merits of plush and leather or leatherette for 

 upholstering, so far as health is concerned. 



9. The comparative merits of carpets and rugs. 



10. The work of the street cleaning department. 



11. What to do to prevent spread of fires in a building. 



12. The public health laws of your state. 



13. The work of the health department of your city or town. 



14. Communicable diseases. 



References 



Hunter, Essentials of Biology. Chap. XXVIL 



Davison, The Human Body and Health (Advanced). Chap. XIV. 



Monthly Bulletin of the New York State Department of Health. 



State Health Bulletins. 



Bulletins of the Department of Health of cities and towns. 



Rensselaer, Martha von, " Practical Housekeeping." Cornell Univer- 

 sity Reading Course, Series 1, No. 3, 1903. 



Northend, M. H., "A Fresh Air Sleeping Room." Suburban Life, 

 March, 1909. 



Miiller, J. P., The Fresh Air Book. 



Ritchie, J. W., Primer of Sanitation. 



Prudden, M., Dr., Dust and its Dangers. 



Sedgewick, Municipal Sanitation. 



Westwood, E. H., " Sleeping in the Open." Pictorial Beview, April, 

 1910. 



Hendrick, B. J., " Chicago's Fight for Fresh Air." McClure's Maga- 

 zine, August, 1910. 



SUMMARY V 



The nature and hygiene of some congestions or inflam- 

 mations. (See Hunter, Essentials of Biology, page 394^ 



a. Nature 



Observations. 1. Carefully note what is shown in Figure 77. 

 What is the main difference shown between arterial capillaries 

 (arterioles) in a normal state and when congested ? 



Note. Whenever congestion or inflammation occurs, the 



