EXHALENT SYSTEM. 161 



are successful ; but in the case of the bleeding artery they 

 have no effect. 



Q. How do you know that blood found in serous cavi- 

 ties is exhaled? 



ft. Because, after the most critical examination, no ero- 

 sion could be ascertained. 



Q. What serous cavities are least liable to these bloody 

 exhalations? 



ft. The tunica vaginalis testis, and the tunica arach- 

 noides. 



Q. Are the, bloody exhalations in serous cavities always 

 from active haemorrhage ? 



ft. The exhalation of blood in these cavities is some- 

 times passive. 



Q. Does the water in anasarca being reddish, imply 

 active haemorrhage or febrile dropsy ? 



A. It does not, for the fluid of dropsy is often of this 

 reddish hue in passive cases. 



Q. Are preternatural exhalations uniform? 



ft. They vary very much, as you may see in the vari- 

 ous aspects of fluids in the different serous cavities. 



Q. Why are not secretions exhaled as well as fat, se- 

 rum, and other fluids? 



ft. Because the glandular apparatus is different from the 

 exhalent. 



Q. How does Mascagni suppose exhalations to be 

 made? 



<ft. By lateral pores in the vessels. 



