23 



ment permits of a second subsidiary treatment of the subject by group- 

 ing the parasites together as regards the organs they infest. Tlie vari- 

 ations arising are due in part to the antagonism between the two ar- 

 rangements adopted. The above plan was adopted more for conven- 

 ience than for its scientific accuracy from any single point of view. 



Concluding, the author desires to give due recognition to all sources, 

 from which he has drawn in preparing this work. The chief sources 

 of information have been the admirable works of Leuckart, Die Mensch- 

 lichen Parasiten, 1868; Eaillet, Elements <te Zoologie, 1885; Neumann, 

 Traits des Maladies Parasitaires, 1888 ; and A. E. Verrill, Parasites of 

 Domestic Animals, Rep, Conn. Board Agriculture, 1870-'71. An en- 

 deavor has been made to mention every other source in the text. 



MEAStTBBMENTS. 



The following tables will assist the reader in reducing the measure- 

 ments given in one denomination to those in another. 



Metric system in medicine. 



Grams. 



1 grain or 1 minim equals 0.06 



15 grains or 15 minims equal -■ !• 00 



1 dram or 1 fluid dram equals 4. 00 



1 ounce or 1 fluid ounce equals 32.00 



The cubic centimeter may be considered identical with the gram for 

 water or aqueous solutions. 



Metric system in measurement. 



Incli. 



1 meter equals 39.37 



1 centimeter equals 3937 or | 



1 millimeter equals 03937 or ^V 



One-hundredth millimeter equals 00039 or Tj/inr 



One-thousandth millimeter equals 000039 or ^zhrs 



25 millimeters equal J 1 nearly. 



OTHER MEASUREMENTS. 



For approximate measurements a liter (2.113 pints) may be consid- 

 ered equivalent to a quart; a kilogram to 2^ pounds avoirdupois. 



When graduated measures of weight or volume are not at hand, the 

 flock-master may use some of the common household utensils. Pint 

 and quart bottles, so called, should be tested, as they vary in size. 

 The pint contains 16 ounces, or aboijt a pound in weight. The smaller 

 bottles are known as 2, 4, 6, 8, and 12 ounce bottles. Vials are quite 

 common, those made to contain 1, 2, and 4 drams being most abundant. 

 A set of bottles can always be obtained at the drug-store and the size 

 marked on them. It is far better, however, to buy a set of graduates 

 and other measures, for they are of daily use. Common tumblers con- 



