Grade 

 Date . 



EXERCISE 1. (15) 



Object. — To determine the physical differences between milk, cream and 

 skimmilk. 



Apparatus. — Samples of milk, cream, and skimmilk, beakers, and micro- 

 scopes. 



Note to Instructors. — Slides of skimmilk, whole milk, and cream should be prepared 

 previous to the class period, and adjusted in the microscope, as students in first taking 

 up this work will not be familiar enough with the different apparatus to properly 

 make up the slides. 



Step 1. Study the differences found in the appearance of the sample of the 



milk, cream, and skimmilk. 

 Step 2. Study the field under the first microscope. Note the size, the shape, 



and the color of the fat globules. 

 Step 3. Study the field under the second microscope. Note the number of 



fat globules compared with those in the field of the first microscope. 



Note their size and shape. 

 Step 4. Study the field under the third microscope. Note the size and 



shape of the globules compared with those of the second microscope. 

 Step 5. Draw one of the fields in the space of this page. Write up the steps 



at the bottom of this page, explaining all the differences noted in the 



three fields. 



