October Z, 1914] 



SCIENCE 



487 



Page 10 : " Potassium compounds appear to 

 be of minor importance in the economy of ani- 

 mals. They occur in the blood of all herbivora 

 as a necessary consequence of their presence 

 in the food." 



" Potassium compounds . . . form nearly 

 one quarter of the ash of milk. ... A farmer 

 producing milk, therefore, will find it profit- 

 able to use potash manures unless his soil is 

 naturally well stocked with that ingredient. 

 Practically the whole of the potash in the food, 

 €xcept what is exported in the milk, is re- 

 turned to the land in the droppings of the ani- 

 mals." 



Page 13 : Referring to the ingredients of the 

 ash the author says : " From the point of view 

 of the practical cattle feeder they are all un- 

 important, inasmuch as they are always pres- 

 ent in the natural food of the animals." 



Page 15 : " Carbohydrates are produced by 

 animals only in in^gnificant quantities." 



Page 46 : " Fats do not form part of the tis- 

 sues of plants as they do in animals." 



Page 93 : " The composition and properties 

 ■of lactochrome . . . are quite unknown." 



Page 99 : " The collagen (of bones) acts as a 

 kind of cement and holds the particles of min- 

 eral matter together." 



Page 104: "No means is known by which 

 this difficulty (the presence of metabolic nitro- 

 gen in the feces) can be overcome; but the 

 amount of such ingredients is probably small 

 and approximately constant. In practise it is 

 ignored." 



Page 109 : In discussing the absorption of 

 nutrients and their passage into the blood and 

 to the heart, the liver is not mentioned. 



Page 132 : " This amount (the maintenance 

 requirement of digestible protein) may be esti- 

 mated, as previously shown, from the amount 

 of nitrogen in the urine which contains all of 

 the nitrogenous products of metabolism." 



Much of the matter relative to foods is of 

 local significance and not applicable to the 

 United States, thus (page 255), referring to 

 the storage of ensilage in a silo, "the expense 

 is greater than that involved in the waste of 

 fodder when the silage is made in a stack." 



" When the expense of a built silo or the alter- 

 native loss due to charring at the outside of a 

 stack is added to the losses due to fermenta- 

 tion, it is obvious that silage making is not a 

 profitable method of preserving fodder; and is 

 now rarely practised in this country." 



E. B. Forbes 

 Agkicultueal Experiment Station, 

 woostek, o. 



SCIENTIFIC JOURNALS AND ARTICLES 



The July number (Vol. 15, No. 3) of the 

 Transactions of the American Mathematical 

 Society contains the following papers: 



H. F. Blichfeldt : " A new principle in the 

 geometry of numbers, with some applications." 



F. E. Sharpe and C. F. Craig : " An applica- 

 tion of Severi's theory of a basis to the Kum.- 

 mer and Weddle surfaces." 



L. P. Eisenhart : " Transformations of sur- 

 faces of Voss." 



F. E. Sharpe and Virgil Snyder : " Birational 

 transformations of certain quartic surfaces." 



G. M. Green : " One-parameter families of 

 curves in the plane." 



G. A. Bliss and A. L. Underbill: "The 

 minimum of a definite integral for unilateral 

 variations in space." 



L. D. Cummings : " On a method of com- 

 parison for triple-systems." 



W. E. Longley : " An existence theorem for 

 a certain difEerential equation of the nth 

 order." 



The June number (Vol. 20, No. 9) of the 

 Bulletin of the American Mathematical Society 

 contains: Eeport of the spring meeting of the 

 society at Chicago, by H. E. Slaught; "On 

 ovals," by Tsuruichi Hayashi ; " On the class 

 of doubly transitive groups," by W. A. Man- 

 ning; Eeview of Christoffel's Gesammelte 

 mathematische Abhandlungen, by L. P. Eisen- 

 hart; Eeview of Vivanti's Esercizi di Analisi 

 infinitesimale and Dingeldey's Sammlung von 

 Aufgaben zur Anwendung der DifPerential- 

 und Integralrechnung, by E. C. Archibald; 

 " Shorter Notices ; " Heiberg's Archimedis 

 Opera Omnia, volume II., Heath-Kliem's 

 Archimedes' Werke, and Msennchen's Geheim.- 



