28 EXPERIMENT STATION RECORD. [Vol.38 



only. The effect may be observed in the larger species in concentrations as low 

 as 0.00005 molecular. In the smaller species the effect of barium chlorid is 

 inhibited by the presence of cerium trichlorid or cerium bichlorid in certain 

 proportions. 



Certain effects under irrigation of copper compounds upon crops, R. H. 

 FoKBES {Arizona Sta. Bui. 80 {1916), pp. 145-238, pis. 4, figs. 16).— Tiiis work, 

 which was carried on cooperatively between the Arizona Experiment Station 

 and other institutions, has already been noted from another source (E. S. R., 

 37, p. 527). 



Injury caused to vegetation in grounds near ironworks at Terni, Italy, G. 

 Ampola and A. Vivenza {Ann. R. Stas. Chim. Agr. Sper. Roma, 2. ser., 8 

 {1916), pp. 139-164; alis. in Internat. Inst. Agr. [Rome], Inteniat. Rev. Sci. 

 and Pract. Agr., 7 {1916), No. 5, pp. 7^6, 7^7). — In continuation of work pre- 

 viously noted (E. S. R., 30, p. 432), the authors state that on land thickly planted 

 with trees, bushes, and vines and so situated as to receive the smoke and gaseous 

 products from several chimneys progressive injury was done the plants. Grape- 

 vines were found to suffer most seriously, showing a general decline of vegeta- 

 tive power, also a scorching effect on the leaves. Such plants as fig, apricot, peach, 

 and certain nuts are injured seriously ; pear, apple, cherry, elm, and olive some- 

 what less ; and willow, poplar, oak, and hazel, also grasses and other plants, 

 little or not at all. The sulphurous anhydrid contained in the air over the 

 grounds ranged from 0.00034 to 0.0004S gm. per cubic foot. 



It is supposed that within a few years the vines and apricots will die out 

 completely on the property investigated, and that the figs and peaches will in 

 large part disappear. 



Some inter- and back-crosses of Fi CEnothera hybrids, B. M. Davis {Oen- 

 etics, 2 {1917), No. 2, pp. 155-185, figs. 6).— The present contribution describes 

 the outcome of crosses made between several species of CEnothera, though these 

 results are conceded to be incomplete owing to the fact that the work was done 

 before methods had been developed to obtain a complete germination of CEnothera 

 seed, as published by the author (E. S. R., 84, p. 185) and by De Vries (E. S. R., 

 85, p. 332). Other work by both of these authors is referred to and discussed. 



Among the results noted, it is stated that experimental germination tests in 

 Petri dishes showed some remarkably high sterility figures in the results of 

 crosses between CE. biennis and (E. muricata. Some new types are added to 

 the hybrids known to result from this crossing. Crosses between (E. biennis 

 and CE. franciscana showed a much greater variety of forms with much less 

 seed sterility than did those between (E. biennis and (B. muricata, and this range 

 of forms is interpreted as segregation. The results for double reciprocals from 

 Fi hybrids of CE. biennis and CE. grandiflora also Indicated a segregation of 

 factors. 



The presence of a class of dwarfs was noted in all of these cultures. Data 

 involving CE. muricata and (E. gigas show situations presenting problems of 

 sterility. Remarkable linkages or correlations were recorded, especially in 

 crosses of CE. biennis and CE. franciscana. 



A correlation between endosperm color and albinism in maize, J. H. 

 Kempton {Jour. Wash. Acad. 8vi., 7 {1917), No. 6, pp. 146-149). — While grow- 

 ing seedlings from an ear of maize which had been obtained from a self-fertilized 

 first generation plant resulting from a cross between Zea tunicata and Z. ramosa, 

 as described by Collins (E. S. R., 37, p. 536) and having both yellow and white 

 grains in the ratio approximately of 3: 1, the author found what is thought to 

 be a correlation (probably in the nature of a coherence) between endosperm 

 color in the seed and chlorophyll development in the seedlings. Several degrees 



