1920] — Wherry,—Soil Tests of Ericaceae and Other Families 47 
that they are being temporarily grown in soil of that acidity in Gil- 
lett’s nursery at Southwick, Massachusetts, although in nature they 
seem unable to thrive permanently in soils of like reaction. 
The results of tests made on soils supporting other groups of reac- 
tion-sensitive plants may well be tabulated like the Ericaceae; this 
is done in Tables IV, V, and VI. 
TABLE IV. Soir. REACTIONS OF ORCHIDACEAE. 
(Observed in northern Vermont and New Hampshire, 1919.) 
Specific Acidities Spec. Alk, 
300 100 30 10 3 1 8 -10 
edi- Sub- Minim- N. Minim- 
acid acid acid alk. 
Cypripedium arietinum R. Br.. - d. Ap X x - 
parviflorum Salisb.. - 0... X AX Xx o 0--— 
tf var. pubes- 
cens (Willd.) Knight - 0.50 A X x D. o 
kf hirsutum Mill. (reginae) - - = X X x0 
A DOME AN ia ck: e M o + - om 
Habenaria hyperborea (L.) R. Br. - - = ex X E ur 
dilatata (Pursh) Gray.. - - >- Mess x X X cx 
b " var. media (Rydb. ) 
AIDS co In. i. - = mie X > aes 
Ü obtusata (Pursh) Richards - X CE Aix X - - 
á DEM LORE. arri. ai -= X UM x = - m5, > 
mf orbiculata (Pursh) Torr... - xo oe X - - - =- 
" macrophylla Goldie...... - X X X - - - > 
a bracteata (Willd.) R. Br.. - > eae? « S x - - - 
ff psycodes (L.) Swartz. .... o 0 79 o. X £ - - 
fimbriata (Ait.) R. Br.. - 0-140 A -= - B 
Pogonia ophioglossoides (L.) En X O 0 - -= = mis 
Arethusa bulbosa L......:......... X i 
Epipactis repens var.  ophioides 
(Fern.) A. A. Eat...... - 
£e yere (ped): Ae A. 
Listera cordata (L.) R. Br.......... 
convallarioides (Swartz) Torr. 
Corallorrhiza trifida Chatelain...... 
maculata Raf......... 
Microstylis monophyllos (L.) Lindl.. 
m unifolia (Michx.) B. S. P. 
Liparis Loeselii (L.) Richard. ....... 
Calypso bulbosa (L.) Oakes......... 
X 
»* 
j 
I 
| 
I 
t OG SET uu DEDE bd 
| ea ce 
Io X1 M LE 
HOO] 15» Xu 
pe pd I beet bd bd [t 
«x 1b(19»u1 
E 
The above list supplements the one previously published by the 
writer,! in which species of more southern distribution were treated, 
although a few appear in both lists. It is noteworthy that there are 
among the northern orchids many with greatest development in 
circumneutral soils, whereas most of the southern species prefer 
! Journ. Wash. Acad. Sci., viii. 589 (1918). 
