968 EXPERIMENT STATION RECORD. 



on the plats long devoted to wheat cnltiire and of the scant growth on 

 tlie field which had long been devoted to leguminous jilants the author 

 does not present any explanation which he considers entirely adequate. 



On land which for nearly 50 years had not been used for a leguminous 

 crop, but had been devoted to a rotation of roots, cereals, and fallow, 

 yellow trefoil made a strong effort to establish itself among the culti- 

 vated crops, and was exterminated with difficulty. " It is quite evident 

 that when the land is kept free from leguminous plant growth matters 

 accumuhite in the soil which are higlily favorable to these plants. ... It 

 is tolerably certain that the matter accumulated does not consist of 

 ordinary manure ingredients." 



On the distribution of assimilated iron compounds other than 

 heemoglobin and haematins in animal and vegetable cells, A. B. 

 Macallum {Proc. Boy. Soc, 57 (1895), N'o. 343, pp. 261, 262).— Bj 

 means of freshly prepared ammonium hydrogen suli)hid the author has 

 demonstrated the presence of iron other than the above in plant and 

 animal cells. Whether chlorophyll contains iron is yet to be demon- 

 strated. Some of the more important facts ascertained by the author's 

 investigations are as follows: 



(1) Iron firmly combined is a constant constituent of animal and 

 vegetable chromatin. Another compound, less rich in iron, is found in 

 nucleoli. 



(2) The chromophilous substance in ferment-forming cells contains 

 iron, and the cytoplasm of protozoan organisms, which also probably 

 secrete ferments, yields evidence of the presence of a firmly combined 

 iron compound. 



(3) A firm compound is present in the chromophilous substance of 

 the cytoplasm of fungi. 



(4) Of the non-nucleated organisms, bacteria, owing to their minute- 

 ness, have, with one exception, given little evidence of the presence of 

 an organic iron compound; but in the Cyanophycece the chromophilous 

 portions of the " central substance" contain iron, and iron maybe dem- 

 onstrated in the peripheral granules formed of the so-called cyauophycin. 



Histological experiments on the development of mucors, M. L^ger {Compt. 



Bend., 120 {1895), No. 11, pp. 647-649). 



The comparative anatomy of the fruit of conifers, M, Radais {Ann. Set. nat. 

 Bot., 19 {1S94), ser. 7, No. 3-6, pp. 165-368, j;?s. 15). 



Concerning the plant cell membrane, C. Correus (Pringslieim's Jahrb. mas. Bot., 

 26, pp. 587-673; ahs. in Bot. Ztg., 63 {1895), II, No. 8, pp. 125-127). 



Plant forming elements, G. Abbey {Jour. Hort., 1895, n. «., No8. 773, pp. SS2, 333; 

 774, pp. 354-356). — A semipopular article on plant nutrition. 



The mineral food required by the lo-wer fungi, I, H. Mausch (Sitzungsber. 

 Wien. Akad. Wissensch., 1895). 



Concerning the w^aste products of plants, G. Jaeger {Ber. deut. bot Ges., 13 

 (1895), No. 2, pp. 70-72). 



Contribution to the chemistry of chlorophyll, VI, E. Schunck and L. March- 

 LEWSKi {Proc. Roy. Soc, 57 {1895), No. 344, pp. 814-322, fig. 1). 



The production of blue and violet coloring matters in plants, C. Nienhaus 

 {Sclnvdz. Wochenschr. Pharm., 33, pp. 3-11; ahs. in Chem. Centbl., 1895, 1, No. S^ p. 494). 



