2 5° BOTANICAL GAZETTE [^ch 



dividing by the dry weight of the root system the weight of CO, produced is lea* 

 in barley and greatest in oats. This quotient is considered as the indication of 



A 1 * /"* m 



energy 



farm 



of the soil probably arises from the accumulation of the highly toxic organic acids 

 due to the incompletely oxidized products of respiration. 



It should be mentioned here that the authors have studied only the aliphatic 

 excreta and make no mention of any of the aromatic series.— Wm. Crocker. 



Graft hybrids. 



undecided 



been 

 Winkler 



undertook an extensive series of experiments on this subject, using as material 

 two species which will not hybridize in the ordinary manner, namely Solanum 

 nigrum and Solanum lycopersicum. In an earlier paper 1 * he dealt with the 

 production of what he calls chimeras, that is shoots, one side of which resembles 



ing each other. 



ux 



graft 



between the same species by the same method. *« In all, 268 grafts were made, 

 which after decapitation produced over 3000 adventitious shoots. Five of the 

 latter were chimeras and a single one 

 S. lycopersicum on S. nigrum. 



grafting 

 graft 



produced 14 adventitious shoots, 8 of which were pure S. nigrum, 5 S. lycopersicum, 

 and 1 the graft hybrid. The latter was detached and rooted, finally produring 



flowers. 



intermediate 



rded 



"pure line" cultures. Winkler names the hvhrid S. tubineense, and proposes 



nearer 5. nigrum. The purity of both parents was assured by using gua 



nnrp lin^" „„n ttt .....„.,. _j «mi 



S1 gn 



Two 



~. ^^^ua MiUOls are also 

 being nearer the S. lycopersicum. 



termediate 



Strasbur 



™*' found the number of chromosomes to be the same as in each parent 

 Several interesting cytological questions, which Winkler hopes to determine, are 

 involved in the nuclear and chromosome behavior of his graft hybrid. Appar- 

 ently there must be a union of cells, nuclei, or chromosomes, or pe rha P s ° f 



three, in the production of this form.— R. R. Gates. 



I3 Winkler, Hans, Ueber Pfropfbastarde und pflanzliche Chimaren. 



■Ueutsch. Bot Ge<w>ll= «.-../;o * /• 



• Vjesell s- 25:568-576. Jigs. 3. 1907. 

 l\To H 7 ' Solanum tubingense, ein echter Pfropfbastard zwischen Tomate 

 iNachtschatten. Ber. Deutsch. Bot. Gesells. 2 6a: 5 95-6o8. figs. 2. 1908. 

 j s Briefly described by the reviewer in Bot. Gazette 47=84- i9°9- 

 16 ^burger, E M Ueber die Indivi'dualitat der Chromosomen und die Hroj 



B* 



und 



briden-Frage. 



^. j. 1907 



