Rural School Leaflet. 691 



Most test-bottles are made to read as high as 10 per cent. Each percent- 

 age has its number marked on the glass and there are five small spaces 

 each representing .2 per cent between these principal marks. Thus, if the 

 top of the fat column is even with the third short mark above the 7 mark, 

 the top reading would be 7.6; and if the bottom is half way between the 

 first and second short marks above the 3 mark, the bottom reading would 

 be 3.3 ; the difference is 4.3 which is the percentage of fat or number of 

 pounds of fat in 100 pounds of milk tested. 



Azotes. — 



I cc means i cubic centimeter or about 20 drops. 



If the fat column is clouded with white specks, probably the acid was 

 not strong enough, or not enough was used, or the heat was not high 

 enough. 



If the fat column is clouded with dark specks, probably the acid was 

 too strong, or too much was used, or the heat was too great. 



Always keep the acid bottle closed when not in use or the acid will 

 lose strength. Remember that it is a poison and corrosive. 



Lesso>i Xn. 



EGG TYPES. 



By James E. Rice. 



Purpose of the lesson. — To train the pupil's power of observation, 

 especially in his ability to recognize dift'erences in size, weight, form, 

 color, and texture of eggs ; to familiarize him with the characteristic 

 types of eggs that are laid by the different species, classes, breeds, and 

 varieties of domestic poultry ; to note variations from the normal eggs, 

 and to lead the pupil to inquire into the causes for those that are ab- 

 normal ; to afford the pupil training in accuracy of expression in the 

 words used to describe the various forms, colors, and textures of eggs. 



Materials- — • ( i ) A collection of eggs from as many different kinds of 

 poultry as it is i)ossibIe to procure. Eggs from the domestic fowl, ducks, 

 geese, turkeys, guineas, pheasants, pea fowl, pigeon, quail, etc., and also 

 from many different breeds and varieties of each of these kinds of poul- 

 try. (2) One or two insect cases. (Fig. 33.) If insect cases can not be 

 secured, a neat bcjx that can be covered tightly will do. (3) Several egg 

 drills and blow pipes. These instruments are not very expensive. They 

 can be purchased at Ward's Natural Science Establishment, Rochester, 

 X. Y., for twenty-five cents each. I have known young persons, however, 

 who could blow the contents from an egg shell with a straw without the 

 aid of drills or blow pipes. (4) Pot of glue. (5) Labels as shown in Fig. 

 '32. (6) Drawing paper. (7) drawing pencils. (S) Lead eraser. C9) 



