54 
Dairy  Cattle  and  the  Butter  Test. 
thought  worth  while  to  insert  Table  IV.,  showing  the  volumes 
in  cubic  microns  of  spheres  ranging  from  1 to  12  microns 
in  diameter. 
Table  IV. — Table  of  Diameters  and  Volumes  of  Spheres. 
Diameter 
Volume 
Diameter 
Volume 
12  IX 
904:'8  c.n. 
6 fx 
113-1  C.fx. 
Wix 
696  9 c./u. 
6 fx 
65-4  c-ix. 
10  n 
523-6  c./i. 
4/a 
33-3  c./a. 
. 
381-7  c./ti. 
3 IX 
14-1  c./u. 
8 n 
268  1 C-M. 
2 IX 
4'1  c.ix. 
179-5  C.yU. 
1 IX 
0-5  C./U. 
Table  V.  is  obtained  from  the  figures  in  Table  III.  and 
is  self-explanatory.  The  degrees  of  uniformity  in  the  sizes 
of  the  fat-globules  was  estimated  by  plotting  on  squared  paper 
the  percentage  of  fat  in  volume,  against  the  different  sizes 
of  the  globules,  he.,  the  figures  in  each  of  the  horizontal  rows 
on  Table  III.  (but  giving  the  percentage  of  sizes  for  each 
micron  from  1 to  12)  against  the  respective  diameters  of  the 
fat-globules.  From  the  curves  so  obtained,  the  degree  of 
uniformity  is  readily  estimated,  the  sharper  the  rise  and  fall 
of  the  curve,  the  less  uniform  is  the  distribution  in  size  of 
the  fat-globules  of  the  milk.  As  in  Table  V.  the  different 
samples  are  placed  in  order,  from  the  coarsest  (Lincolnshire 
Red  Shorthorn)  to  the  finest  (South  Devon),  it  is  not  necessary 
to  attempt  a classification  of  the  different  breeds  of  milk 
into  degrees — “ coarse,”  “ medium,”  and  “ fine.” 
Table  V. 
No. 
Breed 
Amount  of  fat  con- 
tained in  globules  of 
5 IX  and  up-wards 
Uniformity  in 
size  of  globules 
1 
Lincoln  Red  Shorthorn 
Per  cent. 
81-61 
Fair. 
2 
J ersey 
71-92 
Fair. 
3 
Dexter 
65-46 
Fair. 
4 
Guernsey  .... 
64-58 
Good. 
5 
Ayrshire  .... 
63-09 
Poor. 
6 
Red  Poll  .... 
62-.56 
Bad. 
7 
Kerry 
60-02 
Very  Good. 
8 
Shorthorn  .... 
55-02 
Good. 
9 
Longhorn  .... 
53-75 
Fair. 
10 
Gloucester  .... 
51-68 
Very  Good. 
11 
Welsh 
45-12 
Poor. 
12 
Devon  
44-74 
Poor. 
13 
South  Devon  .... 
37-31 
Poor. 
