20 LABORATORY METHODS OF 



experiments of very great value to you. This work is to 

 introduce the student to the study of Histology. The 

 word Technic means the various manipulations neces- 

 sary to get the tissue ready for the microscope. 



The term Histology means the microscopic study of 

 tissues. The unit of tissues is a cell. It is our work 

 to investigate the relation that the cell and intercellular 

 substance bear to the tissues and organs of the animal 

 or plant. Since we are studying the human body we 

 will confine ourselves to the study of the tissues and 

 organs of animals, i. e., cat and dog, mostly. 



In the beginning we will study the cells of the yeast- 

 plant, spirogyra and protococcus in the plant kingdom, 

 and the green euglena and slipper animalcule in the 

 animal kingdom each one for a special purpose: the 

 euglena, for its property of containing chlorophyll in 

 its body and for its possessing the power of motion; 

 the slipper animalcule, for its mode of reproduction 

 and its mode of locomotion. 



We will begin with the yeast plant and go upwards 

 and see if there are any changes in the vegetable king- 

 dom that resemble those in the animal kingdom. 



Exercise No. 6. Make a spread of Protococcus. 



I. From the green growth on a tree or fence, take a 

 small bit of the growth and place it in a petri-dish, 

 moisten and put in a warm place for twelve hours, 



