New York AGRICULTURAL EXPERIMENT STATION, O20 
maturing variety. The histology of grafts has been more care- 
fully studied’? than the physiologic relation of stock and 
Scion, though the latter is probably of more importance. Gen- 
erally, only the morphological and color modifications are 
noted. We have numerous examples of visible end-reactions 
which seem to be due to certain stock-scion relations; such 
as result in graft-hybrids, as shown by H. Winkler,*! and 
others transmitting albinism from the stock to the scion, as is 
often shown by grafting a green variety of Albutilon thomp- 
soni on an albino stock of the same species. But the trans- 
mission of invisible qualities from one symbiont to another 
lias but seldom been investigated, though it probably always 
occurs more or less. It has been shown by E. Strasburger™? 
that the poisonous atropin from a Datura stramonium scion 
was transmitted to the tubers of a potato stock upon which 
it was grafted. 
An interesting summary and extension of this question is 
given by Herse.®* 
As regards soil and moisture—Some differences of obser- 
vation and opinion are found as regards the character and 
location of land which is conducive to winter-hardness of 
fruit trees. According to some authors, trees on high, dry 
knolls, and according to others, those on low, wet places are 
most susceptible to winter-injury. <A distinction should, per- 
haps, be made between injury to tops and injury to roots, 
though they sometimes occur at the same time. From the 
observations by others it seems that aerial parts are more 
often injured in low, wet places (probably because the in- 
jurious temperature came when the wood was immature), 
°F. Schmitthenner. Verwachsungserscheinungen an Ampelopsis- und 
Vitis- Veredelungen. Ztschr. Pflanzenkrank., 18: Beigabe I, pp. 11-20. 
1908. See also Ueber den Einfluss des Reises auf die Unterlage. C. 
Mikosch. Wiesner-Festschrift. pp. 280-6. Wien. 1908. 
5t Solanum tubingenese, ein echter Pfropfbastard zwischen Tomate und 
Nachtschatten. Ber. deut. bot. Ges., 26A: 595-608. 1908. Zitschr. Bot., 
1: 315-45. 1909. 
* Ueber Verwachsungen und deren Folgen. Ber. Bot. Ger., 3: xxiv—xl. 
1885. 
ST. Herse. Beitriige zur Kenntniss der histologischen Erscheinungen 
bei der Veredelung der Obstbiume. Landw. Jahrb., 37: Erg. 4: 71-136. 
1908. 
