268 
A G Tansley. 
34. 
Sachs, J. 
“ Uber den Einfluss der chemischen und physikalischen 
Beschaffenheit des Bodens auf die Transpiration der 
Pflanzen.” Landvv. Versuchsst., Bd. 1, 1859, p. 203. 
35. 
J 7 
Erziehung von Landpflanzen in Wasser.” Landvv. Ver¬ 
suchsst., Bd. 2, 1860, p. 22. 
36. 
Sziics, J. 
“ Experimented Beitrage zu einer Theorie der antagonis- 
tischen Ionenwirkungen. I. Mitteilung.” Jahrb. 
fUr vviss. Bot., Bd. 52, 1912, p. 85. 
37. 
Tottingham, W. E. “ A Quantitative Chemical and Physiological Study 
of Nutrient Solutions for Plant Cultures.” Physiol. 
Researches, Vol. 1, No. 4, 1914, p. 133. 
38. 
True, R. H 
., and Bartlett, H. H. “ Absorption and Excretion of Salts 
by Roots as Influenced by Concentration and Com¬ 
position of Culture Solutions.” U.S. Dept, of Agri¬ 
culture Bur. of Plant Industry, Bull. No. 231, 1912. 
39. 
*> 
and Gies, W. J. 11 On the Physiological Action of Some of 
the Heavy Metals in Mixed Solutions.” Bull. Torr. 
Bot. Club, Vol. 30, 1903, pp. 390-402. 
40. 
Wolf, W. 
“ Die Saussure’ schen Gesetze der Aufsaugung von einfachen 
Salzlosungen, usw.” Landvv. Versuchsst., Bd. 6 , 
1864. 
INTERNATIONAL PHYTOGEOGRAPHIC EXCURSION 
(I.P.E.) IN AMERICA, 1913. 
(i continued from p. 92). 
Medford and Crater Lake. 
D URING the afternoon, evening and night of September 2nd 
we travelled southwards from Tacoma to Medford on the 
“ Shasta Limited” of the Southern Pacific, one of the crack trains 
of this line, the excess fares for which had been paid by our kind 
hosts of the Commercial Club at Medford, Oregon, our next stopping 
place. Thus the hospitality of our Medford friends began before 
ever we arrived at their city. It was impressed upon us that during 
the three days on which we were the guests of the club not a 
single member of the party was to spend a cent, and indeed it was 
almost impossible to do so. It is as difficult as it would be 
invidious to single out the kindness and hospitality shown us at 
any particular centre for special appreciation, hut our treatment at 
Medford and during the trip to Crater Lake would certainly be 
hard to forget. 
