830 EXPERIMENT STATION KECOKD. 



of different rations for this purpose, the length of time the feeding 

 should be continued, und the eoniparativi^ cost of the gains made. 



In the compilation referred to data are summarized showing the 

 amounts fed to their horses ))y tire companies, express companies, 

 packing houses, and others employing large numbers of animals, as 

 well as the rations fed to farm horses at the experiment stations. On 

 an average the ration of the American draft horses at light labor was 

 found to supply, per thousand pounds live weight, approximately one 

 pound of digestil)le protein and fifteen thousand calories of energy. 

 Similar values for horses at moderate work are one and one-half pounds 

 of digestil^le protein and twenty-three thousand calories. These values 

 are considerably lower than those called for by the Woltf-Lehmann 

 feeding standards. It is interesting to note that, basing his deduction 

 on data of an entirely different character, Zuntz has pointed out that 

 the Wolff' standards are too high. Other investigators have reached 

 the same conclusion. The sul^ject is certainly worth the attention of 

 American investigators, as the importance of devising suita1)le feeding- 

 standards for horses can hardly be overestimated. 



So far })oth American and foreign experiments with horses, gener- 

 ally si)eaking, have been limited to draft animals and arni}^ horses. 

 The food recpiirements of hunters, driving and carriage horses, and 

 other fancy classes is practically an unworked field so far as experi- 

 mental Investigations are concerned. 



The Lit)rarv of Congress has commenced the printing of a series of 

 cards which will be helpful to those in charge of agricultural lil)raries 

 and to the users of such libraries in general. This series of cards is 

 devoted to the accessions which are being constantly made to the Lil>rary 

 of this Department. These are uniform in size with the catalogue 

 cards now so generally used by libraries, and contain the name of the 

 author and title of the book, and a quite full description, the contents 

 frequently being noted. They are aAailable for purchase ))v libraries 

 and individuals, for incorporation in card catalogues, or for record 

 purposes. All or only a portion of the cards of this series ma}^ lie 

 ordered, and as many copies of each title as are desired, to suit the 

 purpose for which they are used. 



Each card l)ears the imprint of the Department Library, and serial 

 numbers are given which correspond with the numbers in the Acces- 

 sions to the Department Library, issued quarterly. This furnishes a 

 convenient means of selecting and ordering the cards, which are dis- 

 tri))uted b}' the Library of Congress, The charge is two cents each 

 for single copies, and one-half cent each for additional copies or dupli- 

 cates. Although every card need not l)e purchased unless desired, 

 lists should be made up in the serial order of the cards, for conven- 

 ience in filling the order, and where this is not done a slight additional 

 charge is made. 



