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Vol. XXI, No. i 
Higher concentrations are associated with slow growth and fruit-bud 
formation. 
(7) The results seem to indicate that the practice of summer pruning 
fruit trees is not only unnecessary but may be detrimental. 
(8) Observations upon the growth and sap concentration of shoots and 
* fruits of the orange tree confirm those made on the apricot tree. 
LITERATURE CITED 
(1) Chandler, W. H. 
1914. SAP STUDIES WITH horticultural plants. Mo. Agr. Exp. Sta. Re¬ 
search Bui. 14, p. 489-552, illus. Bibliography, p. 535-539. 
(2) Dixon, H. H. 
1914. transpiration and the ascent op sap in plants, viii, 216 p., illus. 
London. “ Literature ’ ’ at ends of chapters. 
(3) - and Atkins, W. R. G. 
1912. VARIATIONS IN THE OSMOTIC PRESSURE OP THE SAP OP ILEX AQUIPOLIUM. 
In Sci. Proc. Roy. Dublin Soc. n. s. v. 13, p. 220-238. 
(4) Harris, J. A., and Gortner, R. A. 
1914. notes on the calculation op the osmotic pressure op expressed 
vegetable saps . . . In Amer. Jour. Bot., v. 1, p. 75-78. 
(5) Lawrence, John V., and Gortner, Ross Aiken. 
1916. the cryscopic constants op expressed vegetable saps, as related 
TO LOCAL ENVIRONMENTAL CONDITIONS IN THE ARIZONA DESERTS. 
In Physiol. Researches, v. 2, no. 1, p. 1-49. Literature cited, p. 49. 
(6) Heald, Fred. D. 
1902. the electrical conductivity op plant juices. In Bot. Gaz., v. 34, 
no. 2, p. 81-92, 2 fig. 
(7) Hibbard, R. P., and Harrington, O. E. 
1916. depression op the freezing-point in triturated PLANT TISSUES AND 
THE MAGNITUDE OP THIS DEPRESSION AS RELATED TO SOIL MOISTURE. 
In Physiol. Res., v. 1, p. 441-454. 
(8) Kraus, E. J., and Kraybill, H. R. 
1918. vegetation and reproduction with special reference to the 
tomato. Oregon Agr. Exp. Sta. Bui. 149, 90 p., illus., pi. Literature 
cited, p. 87-90. 
(9) Loeb, Jacques. 
1917. THE CHEMICAL BASIS OP AXIAL POLARITY IN REGENERATION. In Science, 
n. s. V. 46, no. 1197, p. 547-551. 
(10) Lutman, B. F. 
1919. OSMOTIC PRESSURES IN THE POTATO PLANT AT VARIOUS STAGES OP GROWTH. 
In Amer. Jour. Bot., v. 6, p. 181-202. Literature cited, p. 202. 
(11) Reed, H. S. 
1920. THE DYNAMICS OP A FLUCTUATING GROWTH RATE. In Proc. Nat. Acad. 
Sci., V. 6, no. 7, p. 397-410, 3 fig. 
( 12 ) - 
1920. the NATURE op The growth rate. In Jour. Gen. Physiol., v. 2, 
P- 545 “ 5 61 - Bibliography, p. 561. 
(13) - 
1920. SLOW AND RAPID growth. In Amer. Jour. Bot., v. 7, no. 8, p. 327-332. 
Literature cited, p. 332. 
(14) -and Halma, F. F. 
1919. the evidence for a growth-inhibiting substance in the pear tree. 
In Plant World, v. 22, p. 239-247. 
o 
