The Microscope. 87 



others, in which only the nucleus is colored, that the entire 

 structure of the organ can be seen, all parts showing sharp and 

 clear like a goodwood-cut; whereas in the other case, many 

 features are almost lost to view, especially in balsam mounts. 



If instead of treating the preparation with bichromate of 

 potash, a 1 per cent, solution of alum in distilled water be used, 

 a beautifully shaded blue coloration is the result. (" Archiv 

 fur Mikroskopische Anatomie," B. 24, H. 3, S. 468.) 



[TO BE CONTINUED.] 



EXAMINATION IN HISTOLOGY AT THE UNIVERSITY 

 OF MICHIGAN. 



C H. STOWELL. 



THE following questions were asked at the final written ex- 

 amination in Histology, for the freshman class of the med- 

 ical department of the University of Michigan, held March 

 14th. There were 200 papers presented. Each paper was care- 

 fully read and marked. In order for a student to ' : pass," he 

 is obliged to have a mark of 70 on a scale of 100 : 



1. Give the shape, size, color, and origin of the adult human red 

 blood-corpuscle. 



2. Describe any other elements normally found in blood. 



3. What are epithelial cells ? What are endothelial cells ? 



4. Describe the dental pulp. 



5. Give the structure of non-striated muscle, and give places 

 where it can be found. 



6. What are the peculiarities in the structure of the heart ? 



7. Give the coats of a medium-sized artery, in proper order, from 

 within out. Which is the thickest coat? 



8. Name the parts, in proper order, over which air must pass in 

 going from the trachea to the blind termination of the respiratory 

 passages. 



9. Describe the epithelial lining of the different parts of a urin- 

 iferous tubule. 



10. Give the layers of the epidermis, and name the principal bod- 

 ies found in the true skin. 



11. Give the histology of a medullated nerve-fibre. 



12. Describe the mode of termination of nerve-fibres ; a, for the 

 sense of touch ; b, for the sense of taste ; c, for the sense of smell ; d, 

 for the sense of sight (layers of retina). 



