APPENDIX. 



Period of Gestation. This refers to the time which 

 elapses between conception and calving. The average 

 period of gestation of a cow is 283 days. 



Frequency of Heat. As a rule non-pregnant cows 

 will come in heat every 21 days. The period of heat lasts 

 from 2 to 3 days. 



Metric System of Weights and Measures. This 

 system was devised by the French people and has very 

 extensive application wherever accuracy in weights and 

 measures is desired. Some of its equivalents in ordinary 

 weights and measures are given in the following table : 



Ordinary weights and measures. 



1 ounce (av ) .. 



1 quart 



1 gallon 



1 fluid ounce. . 

 1 pound (av.). 



1 grain 



linen 



1 foot.. . 



Equivalents in metric system. 



28 35 grams. 



9464 liter. 



3.7854 liters. 

 29.57 cubic centimeters (c.c.) 



0.4536 kilogram. 

 64.8 milligrams. 



2 54 centimeters. 



0.3048 meter. 



ADDRESSES OF DAIRY CATTLE BREEDERS' ASSOCIATIONS. 



287 



