760 EXPERIMENT STATION RECORD. 



is not a desirable one to use witli molasses in the uianvifaetnre of feeding stuffs. 

 When fonnaldehyde is used as a preservative for sulistances containing nitrogen 

 the jirotein is rendered insoluble but. according to the authors, is not indigestible. 



The cleavage of pi'otein in the intestine, O. Cohnheim {Ztsclir. Physiol. 

 Chem., JfO {1906), No. 1, pi>. (I'l-ll). — Through the combined action of pepsin and 

 erepsin very thorough and probably complete cleavage of protein is induced, 

 according to the author's experiments. The reaction is comparatively rapid, 

 being a question of minutes or hours and not of dnys. 



Concerning proteid synthesis in the animal body, II. Luth.te (Arch. 

 Physiol. [Ppilytr], 11.3 (1!)0U). No. 11-12. pp. .l.'/l-lHI'i). — Sim-e rabbits often live 

 on roots and potatoes, which contain at least ."0 per cent of their nitrogen in 

 nonproteid forms, feeding experiments were made to iearn the value of the dif- 

 ferent nitrogenous constituents. When the nonproteid nitrogenous material of 

 potatoes was fed the rabbits died. In other words, this material did not prevent 

 proteid starvation. 



The importance of individual amino acids in metabolism, Edith G. Will- 

 cock :ind F. (i. Hopkins {■/(hii: I'lu/siol.. .].'> (1<)0C>). No. 1-2. pp. S8-102, dgm. 

 1). — Zein, obtained by extracting corn meal with 75 per cent alcohol, the authors 

 conclude from their experiments with mice '" has no po\A'er whatever of main- 

 t:iining growth in the young animal ; loss of weight begins the moment it forms 

 the sole nitrogenous supply. The addition of the missing tiyptophan group to 

 the zeln has, it is also clear, no power to convert such loss into equilibrium or 

 gain ; a fact possibly due to other deficiencies in the zein molecule, such as the 

 absence of lysin, or the lack of some other amino acid not yet observed. There 

 was no close relationshii) in our experiments between the loss of weight and the 

 length of survival period." 



Can nitrogen equilibrium be produced in the animal body by hetero- 

 albumoses? V. IIenriques and C. IIaasen {Ztsclir. Physiol. Chciii.. J/S {1006), 

 No. 5, pp. 383-3S6). — The experimental data led to the conclusion that hetero- 

 albumoses and also disalbumose serve as protectors of protein. 



Experimental researches on the expiration of free nitrogen from the body, 

 A. Krogh {Hkuiid. Arch. Physiol, IS {1906), No. 5-6, pp. 36.'i-J,20, pi. 1, figs. 

 8).- — Using a Regnault closed-circuit respiration apparatus of special construc- 

 tion, which is described, experiments were made with chrysalides, eggs, and 

 mice with a view to deterndning the possibilities of the excretion of free 

 nitrogen. The experiments ranged in length from a few hours to nearly 3 days. 



Experiments similar to the early series reported by Regnault and Reiseto 

 were also made with small .nnimals confined under bell jars. 



According to the author, his investigations as a whole show only "an 

 extremely slight production of gaseous nitrogen, .-imounting in the case of eggs 

 to 1.5 cc. during the whole period of incubation and in that of mice to 0.01 per 

 cent of the absorbed volume of ox.^gen. The prcMluctions found may be 

 accounted for, as being due to excretion of ammonia or. in the case of eggs, as 

 the setting free of physically dissolved nitrogen. The albumin metabolism 

 does not give rise to any excretion of free gaseous nitrogen from the body." 



The sources of error in the work of earlier investigiitors, who reported a 

 considerable excretion of free nitrogen are pointed out. 



The physiological effect of organic bases derived from beef, F. Kutscher 

 and A. Lohmann {Arch. Physol. [Pftiiycr]. IIJ, {1906), No. 11-12, pp. 553-568, 

 pis. 'i, (Jf/iiis. 7). — Using small animals the physiological effects of oblitin, novain, 

 ignotin, and neosin were studied. 



So far as the experiments showed, ignotin had no physiological effect. 



oAnn. Chini. et Phys.. .",. ser., 2(; (1S5G), p. .'HO. 



