956 EXPERIMENT STATION RECORD. 



presence of nitrates. Nitrates were observed in the cotyledons and also in the 

 hypocotyl, the plants receiving the normal solutions containing nitrates only in the 

 hypocotyl, and those which received no lime containing nitrates both in the hypo- 

 cotyl and the cotyledons. 



From his experiments the author concludes that the absence of nitrates in the 

 cotyledons of normal plants indicates the formation of organic nitrogenous material 

 at the expense of the nitrates, while in plants grown without calcium nitrates are 

 not assimilated. The author tested the results in various ways, and concludes that 

 the presence of lime in a nutritive solution is necessary for the assimilation of nitric- 

 acid salts by plants, whether grown in darkness or in light. — p. fireman. 



Regeneration in plants, W. B. McCallum (Bot. Guz., 40 (1905), Xos. 2, pp., 

 97-120, figs. 14: 4. pp. 241-263, figs. 9). — A study was made of the influence of differ- 

 ent factors on the regeneration of parts of plants, the principal investigations being 

 made with bean seedlings. The influencing factors studied were wound stimuli, dis- 

 turbance in nutrition, changes in water content, accumulation of formative sub- 

 stances, age and degree of maturity, correlation, and growth tension. 



Summarizing his investigations, the author shows that the occurrence of regenera- 

 tion in plants usually involves the replacement of the organs removed, but the same 

 result is often obtained when the organ itself is not removed but is prevented from 

 functioning. The plant ]>< »-s<'<<es innumerable growing points, the majority of which 

 do not develop if the plant body retains anything like a definite organization. In 

 most cases this development does not occur, because these cells capable of producing 

 new organs are held in check by those parts already growing. This nondevelop- 

 ment does not seem to be due to any lack of conditions of favorable growth, but is 

 due to some influence winch an organ, acting perhaps along the protoplasmic con- 

 nections, is able to exert over other parts and so prevent their growth. When this 

 influence is removed, the favorable growth conditions present permit the growth of 

 the parts to occur. 



A bibliography of literature relating to this subject is appended. 



The role of the albuminoid substances of leaves and their accumulation in 

 ripening seeds, N. I. Vasilyev (Zhur. Opuitn. Agron. (Russ. Jour. Expt. Landiv.), 

 6 (1905), No. 4, pp. 385-400) .—In a previous article (E. S. R., 16, p. 746) the author 

 expressed the view that the ripening process of seeds is the inverse of the process of 

 germination, and he assumed that the albuminoid substances produced in the leaves 

 are transported to the seeds, in which they are again transformed into albumin. 



In the present investigation the author examined the leaves of the white lupine 

 during various periods of ripening of the seeds, analyzing separately the petioles and 

 the leaf blades. It was found that with the advanced development of the plants and 

 the increasing ripeness of the seeds the amount of total nitrogen and of albuminoid 

 nitrogen in the leaves decreased, while corresponding amounts of nitrogen increased 

 in the seeds. 



An examination of the distribution of the different groups of nitrogenous sub- 

 stances in the leaves and their petioles showed that the leaves are richer in total and 

 albuminous nitrogen than the petioles. The petioles, on the other hand, are richer 

 in nonalbuminoid nitrogen and especially in asparagin. 



The author concludes that in leaves the nitrogenous substances are synthesized to 

 albumin, and then remain in this form indefinitely as reserve substances. At the 

 time of the formation of the seeds and during their ripening the leaves begin to 

 deliver their reserve albuminous substances to the seeds. The reserve albumin, 

 splitting up, is transported to the seeds in the form of such nitrogenous compounds 

 as amido acids, asparagin, and organic bases. — p. fireman. 



The physiological anatomy of the root tubercles of some Leguminosae, 

 J. Bernatsky (Math. u. Naturw. Ber. Ungarn, 20 (1902), pp. 65-70, figs. 5).— In this 

 paper (not printed until 1905) the author reports a study of the anatomy of the 



