960 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Pitcairnia Micheliana. By Ed. Andre {Bcv. Hort. pp. 576, 577 ; 

 12/1901). — Coloured plate. A pretty scarlet-flowered Bromeliad with 

 pendulous linear foliage, suited for temperate house. Native of Mexico. 



C. T. D. 



Pithecolobium Saman. Anon. {Bull. Bot. Dep. Trinidad, No. 29, 

 p. 347 ; July 1901). — This tree is recommended as a shade for Cacao, and 

 the question of the manurial value of its shed leaves and blossoms dis- 

 cussed, but left undecided. — E. A. B. 



Pithecolobium Saman, Nitrogen Accumulated by Roots of 



(Bull. Bot. Dej). Trinidad, No. 31, p. 396; October 1901).— Describes the 

 advantages derived by a crop of Cedrela odorata planted within the root 

 area of the Saman. — E. A. B. 



PittOSporum crassifolium. Anon. (Gard. Chron. No. 781, p. 431, 

 fig. 130, December 14, 1901).— The " Karo " of New Zealand is said to be 

 of great value for shelter, especially in positions near the sea, as it resists 

 the fiercest gales, and may be found growing in places where it is exposed 

 to the influence of the spray. It should be tried on the southern and 

 south-western coasts, and in other suitable localities. — G. S. S. 



PittOSporum undulatum. By Georges Daurel (Rev. Hort. p. 401 ; 

 9/1901). — One woodcut, representing handsome shrub in the open at 

 Bordeaux. Native of New South Wales, and rather tender. — C. T. D. 



Plant Collectors. By F. W. Burbidge (Gard. Mag. 2,510, p. 795; 

 7/12/1901). — An interesting account of the various men who have dis- 

 tinguished themselves in the arduous work of plant collecting in foreign 

 countries during the past century. The list is a long one of those 

 who have become famous in this direction, and they include men of 

 various nationalities who have been employed chiefly by the English in 

 the work of enriching our gardens with exotic vegetation. A list is given 

 of the more conspicuous introductions of the several collectors. The 

 writer, himself a plant collector, has evidently endeavoured to make the 

 account as comprehensive as possible. — W, G. 



Planting" {IVohim, 2nd Bep. 1900, p. 177).— Experiments of 

 cultural nature have been made, such as the effect of depth of cultivation, 

 pruning, at what time planted, cutting back at planting, or leaving till 

 later. In the latter case there seems to be but little choice between 

 cutting back at planting or leaving till one year later ; the balance, how- 

 over, is somewhat in favour of immediate cutting back. 



Planting trees in November, January, or March shows nothing on the 

 whole in favour of either of these different times for planting. As to time of 

 pruning, spring appears to be favoured. There are many other experiments 

 in progress, both on bush and standard Apple-trees, including summer pinch 

 ing, moderate and hard winter pruning, root pruning every one, two, and 

 four years, lifting every second year, mulching with straw. Of manures 

 applied at different seasons, effect of careless planting, relative advantage 

 of holes dug 2 or 3 feet deep (the shallower are preferred). Planting 



