FRT'IT CiROWIXC 1121 



3 or 4 carpels, rarely 2 or 5, while P. sinensis generally shows 5, rarel)'- 

 3 or 4. 



P. Calleryana has been found highl}- resistant to pear blight. Inocu- 

 lation trials cairied out by the writer showed that the species, if not absolu- 

 tely immune, is at any rate very little affected; if the infection develops in 

 the one year old wood, it never gets as far as the two or three year old wood. 



In no case does it develop in branches with a diameter exceeding 

 half an inch. A two year old P. Calleryana was inoculated at the end of 

 both soft and vigorous branches, as well as in the trunk. The disease 

 did not appear in the trunk, while it did develop in the P. communis used 

 as control and inoculated in the same wa^^ 



The writer's opinion is that the species in question has not received 

 all the attention it deserves from the point of view of fruit production. A*- 

 the Southern Oregon Experiment Station, which has perhaps the largest 

 collection of pear tree species in the world, P. Calleryana was quite success- 

 fully grafted on P. communis as well as P. sinensis. As soon as the writer 

 has sufficiently large seedlings of P. Calleryana he will shield-graft them on 

 different varieties of P. conmunis. 



871 - The Orange Tree in Algeria. — Tr\butI<. in Bulletin Agricole de l' Aheric-Tunisie- 

 Maroc, :yid Series, 21st Year, Xo. 11, pp. 273-278. Algiers, Xov. 1915. 



For some years past the Algerian colonists have been actively growing 

 the orange, and when seeking for information and guidance in reference to 

 starting an orange plantation, they sometimes meet with discordant views. 

 The writer proposes to correct some cm rent errors. 



It is asserted that the orange tree will not grow as far down as the Sahara, 

 while according to the writer's testimony there are no better oranges than 

 those gathered iu some oases. The " Biskra Blood Orange ", which has been 

 grown in that oasis for some years now, is delicious, and fetches very high 

 prices. In the Djerid there are also excellent oranges, and the writer 

 brought back a thoroughly first-class variety from Deggaeh; The free orange 

 stocks there are very fine and covered with fruit ; they thrive well beneath 

 the date trees. In the oases, it would be necessary to make provision, as 

 elsew'here, for a grafting stock possessing resistance to gummosis of the tree- 

 foot, which is not done by the natives, who simply sow sweet oranges or 

 graft on to a lemon tree; which makes certain failures inevitable, above 

 all with b'asin irrigation. 



As regards seed plots and plants, an example is reported from Arba, 

 where a settler who undertook the plantation of 247 acres of orange tree? 

 sows his Seville oranges on a hotbed beneath a glass frame, early in Feb- 

 ruary. About the 15th April the young plants are put into tapering pots 

 about 10 ins, in diameter on top, and about iiins. in height. These pots 

 are buried in the beds early in June ; during the summer they are watered 

 frequeutly, and every month they are given a few grams of blood and super- 

 phosphates. At the end of November the plants may easily reach a height 

 of 23 to 29 in:;., and three months later, i. e. 13 months after sowing, they 

 can be planted out and grafted seven months afterwards, about the month 

 of October following planting. These trees grow rapidly, and six years after 



