250 
the winged petiole of Liriodendron alatum Newb. Also a represen- 
tation of a large sized stipule from a young shoot, in order to show 
its nervation. 
On plate 270 another abnormal leaf is shown, with imperfectly 
formed basal lobes, the nervation of which, especially that of the 
one on the left-hand side, is so strikingly similar to that of the 
stipule as to attract attention at once. On this plate are also fig- 
ures of young leaves showing normal position and arrangement 
of the stipules. 
The figures and descriptions are submitted without further com- 
ment, largely in the hope that it may induce observers to collect 
and study abnormal specimens, which often give us a starting 
point for some important morphological investigation. 
Description of Plates. 
PLATE 269 
Fig. 1, Abnormal leaf of Liriodendron Tulipifera L., showing winged append- 
ages to the petiole, from Passaic, N. J. 
Fig. 2. Liriophyllum populoides Lesq. (Bull. Torrey Bot. Club, plate 227, iD 
part.) 
Fig. 3. Winged petiole of Liriodendron alatum Newb. (Bull. Torrey Bot. 
Club, p/ate 220, in part.) 
Fig. 4. Large stipule of Liriodendron Tulipifera 1., showing nervation, from 
. Passaic, N. J. 
PLATE 270. 
Fig. 1. Abnormal leaf ot Liriodendron Tulipfera L., showing imperfect basal 
lobes, from Passaic, N. J. 
Figs. 2, 3. Young leaves of Liriodendron Tulipifera L., showing normal ar- 
rangement and position of stipules, from Passaic, N. J. 
Description of a supposed new Species of Fossil Wood from Montana: 
By F. H, KNow tron. 
(PLATE 271.) 
For some time the United States Geological Survey has had 
in preparation a Study Series of Rocks for general educational 
purposes, which is to contain a series of typical rocks of this 
country, and in 1891 I was requested to collect for this a set of 
250 specimens of silicified wood. This Study Series is to be ac- 
