VARIETY OF PRODUCTS 281 



Poultry manure for fertilizing purposes should be kept in 

 a dry place, and well mixed with gypsum or dry loam. A 

 flock of 100 birds will produce in a year between 500 and 600 

 pounds (Fig. 155). The product is highly fertile, and well 

 adapted for use hi the home garden. If there is considerable 

 quantity, it can be sold for from $3.00 to $4.00 a ton. 



LABORATORY EXERCISES 



EXERCISE No. 68. Fresh and Held Eggs. Take one dozen 

 fresh eggs and place on a shelf in the schoolroom and leave 

 there for five or six weeks. At the expiration of this time 



FIG. 155. The amount of droppings voided by one hen in a year. The average 

 is estimated at from fifty to sixty pounds, only a small portion of which can be 

 collected and saved. 



secure one dozen strictly fresh eggs. Compare the held and 

 fresh eggs as regards the following points : Flavor, raw and 

 cooked, size of air cell, shell lustre, hardness or toughness of 

 yolk sac when the egg is broken and allowed to run into a 

 dish. Why is the air cell larger in the held egg? 



EXERCISE No. 69. Weight of Eggs. Have the pupils 

 bring to class a dozen eggs each from as many flocks as pos- 

 sible. Weigh each dozen eggs and have determined the 

 average weight per egg. If eggs can be secured from different 

 breeds the comparison will be all the more interesting. 



