226 EXPERIME XT STATION RECORD. [Vol 40 



cated In over 200 pea varieties. The author admits the validity of the re- 

 sults obtained by Mendel and others and Claims that the difference in inter- 

 pretation results from more detailed studies. The inheritance of height In 

 peas, it is stated, lias become complex only because of studies on new or dis- 

 tinctly different material, the characters of which are thought to have an- 

 by mutation. A ! ries of crosses Involving height is in progress 



Bearing of heterosis upon double fertilization, D. F. JoRXS [Bot. <:<i;.. 65 

 {1918), No. ■'/. pp. -H'l-S.Li, fi;is. 5). — Collins and Kempton having shown that in 

 maize the endosperm may be Increased In amount as an Immediate result of 

 crossing (E. s. i:.. •_'*.•. p. 229), the author has obtained what is regarded a^ 

 still more conclusive evidence from reciprocal i in maize, employing 



pollen mixtures similar to those used by these contributors, Everj of the 



L' i ears baving both selfed and cros eds gave an Increase in size of the 



crossed as compared with the selfed seeds ranging from 5 to '.'>'> per cent The 

 complete data are to be published elsewhere, aa they relate more directly to a 

 different Investigation. 



An examination of all the data is said to show that there i- no significant 

 correlation between the amount of Increase and the proportion of the two kinds 

 of soils iseifed and crossed) that wen- present in any ease. This particular 

 demonstration of taeto a not known to have been made for any plant other 



than maize, but Since the main facts of xeiiia and heterosis as determined in 

 maize do not differ appreciably, it i> thought from the results obtained that the 

 phenomenon of Increased endosperm development by crossing may he producible 

 in many or all angiosperms in which double fertilization occurs. 



Abnormalities in Nicotiana. II. A. An \ia> (Bot. • ' [1918), \ 0. J. pp. 



il.'i t85, figs. tO). — The abnormalities of Nicotiana spp. ami hybrids, here re- 

 ported with discussion, Include synanthic blooms, catacorolla resulting from 

 mosaic disease, the development of two growing points and the production of 

 an abnormal number of corolla lobes. 



Sexuality in Rhizina undulata. EL M. FlTZPATRICK (Hot. da:.. 6~> (1918), 



No. .)'. pp. ..'"/ 126, pit. -'I. This is an account of the sexual pro© in 



/.'. undulata, resulting from what Is -aid to be the first study of this kind 

 applied to any member of the Khizinaee.-e. 



Polyembryony in Quercus alba, 1.. II. II\i;\i v i inn. Bpt. Mi<h. Acad. 8ci., 

 r.) (/."/?>. />/. SI).— A preliminary account i- given of a case of poly- 



embryony noted in 1916 in an acorn which possessed two well-formed and 

 vigorous embryos lying within the same oucellua 



Mistletoe [parasitic on] mistletoe, .1. (J. Bbown [Bot. '.'<::.. 66 (J '■■■ 8, 



p. 1'j-k ]hj. I).- This brief Btatemenl refers to a specimen obtained near Tucson, 

 Ariz. Phoradendron ftavescens, which is found on species of Quercus, Fraxlnua, 

 and Juglans, was parasitized by /'. oaUfornicum, a common parasite of I'arkin- 

 sonia, Prosopis, and Acacia. 



Ecology of northern Michigan dunes: Crystal Lake Bar region. W. G. 

 Watkkman {Ann. Rpt. Mich. Acad. Set., 19 {1917), pp. /.''? 808, pis. ('<. Hot. S).— 

 Tins contains an account of the Crystal Lake region as regards its geography 

 ami geology, the environmental factors, the ecology of the region, and some of 

 the problems suggested by the facts observed. 



FIELD CROPS. 



Experiments In field technique in plat tests, A. C. BdtlTY and TT. K. 11 

 (.four. Apr. Research \i . flf.], t5 (1918), No. ). pp. 151 162). This paper, a con- 

 tribution from the Minnesota l-Ixpcriinent Station, reports the results of ex- 



