212 Conard—Fasciation in 
became weaker below, some of the bundles, the writer states, 
changing their orientation of phloem and xylem and continu- 
ing in the lower normal portion of the spadix as ordinary 
medullary bundles. Since in the sweet potato and in the case 
next to be considered, the internal bundle system vanishes 
entirely, it is especially curious to find some of its members 
in Peperomia becoming parts of the normal structure. The 
medullary bundles found in this plant are not present in the 
other two. This makes the investigation of Peperomia more 
difficult, so that it seems reasonable to suggest that even here 
the internal system may have vanished, some of the medullary 
bundles being distributed inward into the space thus left vacant. 
The second case of ring-fasciation also came from de Vries, 
whose careful investigations have most contributed to make 
teratology a scientific study. The plant was Veronica longifolia. 
Fasciated material of this species was sent to de Vries in 
1887, and by skillful propagation and selection the stock 
yielded in 1893 several hundreds of fasciated flower-trusses ; 
two of these were ring-fasciated (4). The specimens were 
investigated by A. Nessler (17) in 1894. One was 17 mm. 
long, the cavity being 2 mm. in diameter, the tube spreading 
into three lobes at top; the other was divided above on one 
side, and continued as a flat fasciation. Internally the struc- 
ture agreed exactly with that described in the sweet potato, 
except that the spiral trachez of the internal bundle system 
were the elements persisting farthest down into the pith. In 
the sweet potato, the phloem elements were observed lowest 
down. 
Another stem of the same origin, investigated by Nessler, 
contained a ring of vascular bundles in the pith which united 
with the normal ring above but vanished below as in the other 
cases. The only external sign of this was an increase in the 
diameter of the stem. Was this a case of arrested ring-fas- 
ciation P 
