No. 3, July, 1921] PHYSIOLOGY 317 



2165. WiLLAMAX, J. J. Plant mucilage. [Rev. of: Lloyd, F. E. Origin and nature of 

 the mucilage in the cacti and in certain other plants. Amer. Jour. Bot. 6: 156-166. 1919 (see 

 Bot. Absts. 3, Entry 442).] Bot. Gaz. 69: 96. 1920. 



2166. ZiLVA, Sylvester Solomon. The action of ozone on the fat-soluble factor in fats. 

 Biochem. Jour. 14: 740-741. 1920. — The results show that ozone produces a more destructive 

 effect upon the fat-soluble factors than was true with the aeration experiments of Drummond 

 and Coward (see Bot. Absts. 8, Entry 2160) and Hopkins (see Bot, Absts. 8, Entry 2191).— 

 A. R. Davis. 



METABOLISM (NITROGEN RELATIONS) 



2167. Bluxck, Gustar. Die Anpassung der KnoUchen-Bakterien an Nichtleguminosen. 

 [The adaptation of nodule bacteria to non-leguminous plants.] Centralbl. Bakt. II Abt. 51: 

 87-90. 1920.— This is a preliminary report. The bacteria must first be adapted to overcome 

 the external mechanical hindrances as well as the inhibiting ferments encountered after enter- 

 ing the plants. The bacteria were first grown on boiled root extract, or root-extract gelatine, 

 the concentration of the extract being gradually increased. After adaptation to the root 

 extract the organisms are grown on dead roots, but must still adapt themselves to the protec- 

 tive plant enzymes by increasing their own antibodies. Active root extract is prepared by 

 grinding the clean, macerated plant roots into a paste by means of quartz sand. The extract 

 is filtered through a Berkefeld filter into sterile containers. This extract is used in increasing 

 amounts with gelatine as with the boiled extract. The medium is sterilized at 50°C. for 1 

 hour on each of 8 days. When gradually adapted to the activated, organized medium the 

 bacteria are inoculated into living plants. The plants are brought into a state of hunger 

 by culturing in quartz sand and watering with distilled water. The sap flow is lessened 

 by diminishing heat and light. — Anthony Berg. 



2168. Buckner, G. D., A. M. Peter, and E. J. Kenney. The concentration of sodium 

 nitrate tolerated by tobacco plants. Soil Sci. 10: 487-491. 1920.— Wilted or unwilted tobacco 

 plants about 10 inches long were placed in tap water containing varj'ing quantities of NaNOa. 

 Solutions containing more than 1 part of NaNOs to 3750 parts of tap water cause wilting. 

 Concentrations of 150 parts of NaNOs to 3750 parts of tap water cause wilting which is more 

 or less permanent. Solutions containing 2-3 parts of NaNOs to 3750 parts of tap water give 

 the best general development. — W. J. Robbins. 



2169. Fearon, William Robert. A study of some bio-chemical tests. No. 2. The Ad- 

 amkiewicz protein reaction. The mechanism of the Hopkins Cole test for tryptophane. 

 A new color test for glyoxylic acid. Biochem. Jour. 14: 548-564. 1920. 



2170. Gericke, W. F. On the protein content of wheat. Science 52: 446. 1920.— Wheat 

 of the Pacific coast states is conspicuously low in protein, due, it is commonly believed, to 

 peculiar influences of climate. The author has investigated the effect of applications of 

 NaNOs and (NH4)2S04 to plants at different growth periods. Glazed stone jars were filled 

 with a soil low in nitrogen and planted with a pure strain of White Australian wheat. There 

 w^ere added 250 mg. of nitrogen per jar, that is, at the rate of 100 pounds per acre to different 

 jars at different times durjng the growing period of the plants. A table shows a decided in- 

 crease (about 77 per cent )in the protein content of wheat obtained from plants receiving 

 nitrogen when 110 days old, over those treated with nitrogen at the time of planting. For 

 each of the different applications of nitrate made after the time of planting there was a cor- 

 responding increase in the protein content of the wheat. It is concluded that the low protein 

 content of Pacific Coast wheat is not due primarily to the climate, but to insufficiency of avail- 

 able nitrogen at certain growth periods of the plant. — A. H. Chivers. 



2171. Nolte, O. DiingungsversuchemitHam. UberReizwirkungvonKupfer-u. Queck- 

 silberverbindungen. [Fertilizer tests with urine with special reference to the stimulating effect 



