49'2 



JOURNAL OF THK ROYAL HOHTICl LTUJiAL SOCIETY 



shipments of the ladybhd, Rhizobius ventralis, which is known to feed 

 on the scale. 



By 1907 strong colonies had been established in the affected dis- 

 tricts, and the work accomplished by them has been little short of 

 marvellous. They have almost completely subdued the scale, which 

 at one time threatened the destruction of the blue gum, and at the 

 present time both plants and seed of the latter are in as great demand 

 as before the infestation. — G. H. L. 



Hardiness, Relation of Early Maturity to, in Trees. By 



E. A. Emerson {Ann. Rep. Missouri State Bd. of Hort. 1908, p. 152; 

 with 6 figs.). — Points out instances of this correlation and advantages 

 of seed from northern-grown trees over southern.— £J. A. B. 



Heligroland, Garden Plants in. By Dr. P. Kuckuck {Bat. 

 Zeit. 1. Abt. Heft iii. & iv. pp. 49-86; with 2' figs, and 3 plates; 

 April 15, 1910).— This gives a very complete account of the meteoro- 

 logy and climate of Heligoland. It is much warmer in winter than 

 other parts of Germany. There is a good rainfall, plenty of sunshine 

 in summer, but the winds are strong, and storms are very common. 

 The winter is more severe than that of Brighton. The author's 

 research garden is described at some length. It contains an alpinum, 

 a water basin, sandy heaps for dune plants, &c. 



Neither Scots Pine, Firs, nor Silver Fir succeed in the island. 

 Pinus montana and P. Mughus are being tried. 



All except some six of his Pinus insignis seedlings were killed by 

 the hard frosts in winter; Cupressus macrocarpa, Callitris Giinnii, 

 and Sequoia gigantea also died. 



Other plants which have not succeeded in Heligoland are Butomiis, 

 Arundinaria, Chamaerops humilis, Washingtonia, Pontederia, Cordyline, 

 Dracaena Draco, Musa japonica, Quercus Ilex, Q. glaucus, Zelhova, 

 Kadsura, Camphor, Philadelphus , Pittosporu7n heterophyllum, Stran- 

 vaesia, Cherry laurel, Skinimia, Mallotus, Camellia, Cistus laurifoUus, 

 Elaeagnus pungens, Myrtle, Gunnera, Kalmia, Arbutus, Phillyrca, 

 Os7nanthus, most Veronicas, Viburnum, Olearia, and Cynara Scolymus. 



The following are growing, but not doing satisfactorily, viz. Bucliloe 

 (Buffalo grass), Arum italicum, Agave applanatus, Birch, edible 

 Chestnut, Escallonia, Wistaria, Pvhododendrons. 



The following, on the other hand, seem to be doing well, and are 

 quite satisfactory: Typlia, Eulalia, Yucca filamentosa, Montbrctia, 

 Walnut, Willows, Poplars, Quercus sessilifiora (grown from an acorn 

 found in a pigeon's crop), Morus, Fig (fruits), Mesembryanthemum 

 (one species), Nymphaea, ■ Anemone coronaria, Akebia, Poppies, 

 Hydrangea, Saxifraga, Sedmn, Pittosporum, Tobira, Roses (excellent, 

 5000 plants in one garden), Rubus deliciosus, Fragaria cMoensis, 

 Ailanthus, Euonymu^ japonicus, Opuntia Rafinesqui, Daphne Mezereon, 

 Hippophae, Fuchsia, Aralia mandscliurica, Aucuba, Ash, Lilac, For- 

 sythia, Ligustrum, Salvia splendeus, Tomato, one sp. (New Zealand) 

 of Veronica, Ceninuitlins, imd Arlcmisia rupa^iris. — G. F. S.-E. 



