ROCKLING 



6660 



ROCK ROSE 



island, from which the city received 

 its name, are the U.S. arsenal and 

 armoury, about 965 acres in ex- 

 tent. E. of the island the channel 

 has been dammed to provide water 

 power, for the city s industries. 

 These include flour-milling, iron- 

 founding, brick-making, and the 

 manufacture of lumber products, 

 agricultural implements, carriages, 

 stoves, and floorcloth. Settled in 

 1836, Rock Island was incorpor- 

 ated in 1841, and became a city in 

 1849. Pop. 35,200. 



Rockling ( Motetta). Genus of 

 shore fishes belonging to the cod 

 family and nearly related to the 

 ling. They are all of small size, and 



: * mummtmt- " 



Rockling. Motella mustela, tbe 

 five-bearded rockling 



W. 8. Berrldge, F.Z.8. 



are represented in the British seas 

 by several species. The young of 

 one of these was formerly known 

 as the mackerel midge and was 

 long regarded as forming a separ- 

 ate genus. 



Rock Plants. Name given to a 

 large number of miscellaneous 

 genera of plants which nourish in 



the rock garden. Their habitat 

 being mountain slopes, they have 

 certain common characteristics, 

 especially long spreading roots 

 which derive constant moisture 

 from beneath the rocks. 

 ? Towards the close of the 19th 

 century, a careful study of natural 

 conditions brought the rock garden 

 into favour, and it is now often the 

 most brilliant, interesting, and in- 

 expensive part of a garden. Sun 

 and air and good drainage are es- 

 sential. Trees or bushes must 

 never overhang the plants. A full 

 S. slope is too dry for many 

 species. Beneath a deep bed of 

 loam mixed with leaf -mould, silver 

 sand, and lime-rubbish, should be 

 an- ample layer of rubble or small 

 stones to secure drainage. The 

 rocks, carefully grouped and in 

 their natural positions, with only a 

 slight backward tilt, should be 

 deeply embedded, and the soil 

 rammed down tightly, cavities 

 being fatal to the plants. 



For delicate Alpine plants a 

 moraine should be made, viz. a 

 gentle slope composed of a mixture 

 of small chips of stone with a little 

 soil; some 18 ins. deep. Plants of 

 rampant or tall habit, if grown at 

 all, must be kept away from the 

 rest. Among the best rock plants 

 are the smaller species of saxif raga, 

 dianthus, campanula, primula, gen- 

 tiana, phlox, helianthemum, se- 

 dum, aubrietia, aethionema, an- 



drosace, daphne, lithospermum, 

 viola, iris, scilla. See Rock Gardens, 

 How to Make and Maintain Them, 

 L. B. Meredith, 1910 ; The Rock 

 Garden, R. J. Farrer, 1912; The 

 English Rock Garden, R. J. 

 Farrer, 1919. 



Rock Rose (Heliantiiemum 

 chamaecistus). Trailing shrub of 

 the natural order Cistaceae. It is a 

 native of Europe, W. Asia, and N. 



Rock Rose. Flowers of the trailing 

 shrub found on chalk hills 



Africa. It has opposite, oblong 

 leaves, hairy on the upper side and 

 downy beneath. The clear yellow 

 flowers are over an inch across. It 

 abounds on chalk hills and dry 

 soils. Many other species and vari- 

 eties of great beauty are cultivated 

 in rock gardens. 



Rock Plants. 



Arrangement of a small rock garden, showing how the stones can be grouped in their natural positions, 

 and the plants disposed in pockets and crevices 



