The Manufacture of Food 



31 



Summary of photosynthe'sis. We may summarize the facts 

 we have learned regarding photosynthesis by hkening it to 

 a manufacturing process of human invention : 



The factory 



The workrooms 

 The machinery 



The energy 



The raw materials 



The supply department 



The products 



The forwarding department 

 The waste material 



The working hours 



is the green tissue, especially 

 that of the leaves, 

 are the cells. 



is the chloroplasts and the 

 chlorophyll, 

 is the sunlight. 



are the carbon dioxid and water 

 (COaandHzO). 



is the stomata and intercellular 

 spaces, and the water-conduct- 

 ing tissue. 



are carbohydrates : sugars 

 (C6H12O6) and starches 



(C6Hio06)n. 



is the food-conducting tissue, 



and it works both day and night. 



is oxygen, which escapes through 



the intercellular spaces and the 



stomata. 



are all the hours of sunlight. 



The production of fats. In addition to carbohydrates, 

 plants make and use two other classes of foods : fats and 

 proteins. The fats are quite similar to the carbohydrates in 

 composition. They contain the same chemical elements : 

 carbon, hydrogen, and oxygen. The proportion of the 

 oxygen to carbon, however, is smaller. At ordinary temper- 

 atures fats occur in plants both as solids and liquids. The 



