I20 



THE POPULAR SCIENCE MONTHLY 



Field Hospital. 



spared to render clear to the understanding the mysteries of health 

 and disease. All the available arts and sciences had been pressed into 

 service of this great object. The systematic representation of the sub- 

 ject was pursued with great consequence. An introductory lecture was 

 given in the great hall every morning. A culture of living protozoa was 

 projected on the screen in an adjoining dark room, their life histories 

 explained. In another dark room, the production of antibodies in the 

 blood, excited by the action of bacteria, was shown on the screen. Then, 

 the life cycle of the silk worm and the preparation of silk was similarly 

 shown on the screen. Over one hundred microscopes, all in the most 

 perfect working order, and under a splendid system of illumination, 

 served to demonstrate monocellular organisms, mitotic cell-division, 

 fertilization and embryonic development as well as the adult cellular 

 structure of every organ in the human body. 



The gradual development from a single cell of some of the lower 

 animals as well as intra-uterine development of the human embryo was 

 beautifully shown by a series of embryos rendered transparent by the 

 method of Spalteholz. A splendid series of wax and plaster models in 



Field Kitchen. 



