1886. | BOTANICAL GAZETTE. 281 
OPEN LETTERS. 
Spores of Pilobolus. 
At the Buffalo os of the Botanical Club of A. A. A. S., Dr. Farlow 
spoke of an instance in which Pilobolus threw its spore cases a distance of eight 
feet. I have just olanreed in a dark stable, not often used, where aes is a 
dirt floor, that these black “specks” are very thick and some of pel se to a 
san aor marpee k hie ai - a feet, peace 4 face leis £ cals a little higher I 
examined some of th d they are not “ fly-spe 
Agricultur eat Coltege, Michigan. 
Viola tricolar, var. arvensis. 
Seeing by the Gazerre for Septe pager Fira . Gray wishes to know 
whether Viola tricolar, var. arvensis is established “. a wild plant or not I 
might say that the above plant has been es tablished in one - a elds 
for at least ten years, and is steadily spreading itself over a whol 
oodstock, Ontario. Tuomas P. Haas 
Vegetable substance within animal tissues. 
ase of the organization of a vegetable substance within eran ae 
reporte in the Revue de Chirrugie, August, 1886, may be of interest to y read- _ 
’ Prof. . Vaulair, of Liége, was experimenting on the tubo- we _ nerves, 
cry rubber drainage tubes, as decalcified bone was ae 8 
A tu gray vulcanized caoutchouc was us sed, 1} metres ‘idx, I t ‘inch 
thick, walle’ oo, inch thick. 
was successful as regards - regeneration of the nerve. 
~ was being absorbed, and finally it ae 
e 
parenchyma, ie a large number of "blood ¥ ssels. The stroma formed a com- 
pact resisting mass of fine interlaced couuectied tissue fibers, and cells occupy- 
a tw ety op heres yt some were polygonal, others. 
The connective tissue took a bright 
4 of Le capillary type; in some the walle 
shad and resembling normal vascu 
Ww 
lar endothelium; there were also other ‘ope 
e outer pe of the tube was ir and fungous; the inner stat 
line of Pepe from the subjacent tiss tiss 
ad become assimilated to the surrounding con wore 
ppear: 
ill observe that this absorption or rather 0 organizatio ofa 
our readers W 
structureless vegetable exudate is different from the revivification of pet 
e sponge, e here w he convers ag one ani tissue into anot nl 
ave not ‘become a as far 
bstance 
known, save through the laboratory of the alimentary 
Your oy aders ell find a more extensive eae Ce Tae "Medical Record, Oc- 
A. W. Brayton. 
acted Ind. 
