152 Harker: Chemical Notes on Lake District Rocks. 
Of the diabases of the Lake District and adjoining country 
we have the following analyses:—No. (95) is by Dr. R. Hellon;* 
(96) to (98), of a much decomposed rock of doubtful relations at 
Gleaston-in-Furness, by Sir H. Roscoe ;t (99) by Mr. Hutchings, ¢ 
silica-percentage only. 
(95). 48°42. Diabase, Robin Hood, Ravsasthwatte: 
96). 45°54. Diabase, Gleaston, Low Furness. 
(97). 50°96. Another specimen of the same. 
(98). 51°10. Another specimen of the same. The rock where 
freshest gave sp.gr. 2°92. 
(99). 45°65. Diabase, above Easedale Tarn, towards Langdale; 
s "95; 
In the paper just cited Mr. Hutchings also gives silica- 
percentages of two rocks of intermediate composition (pp. 537; 
544). No. (100) seems to be an example of the less acid quartz- 
porphyries or quartz-porphyrites common as small intrusions in 
some parts of the district; (101) is a less usual type of rock. 
(100). 60°45. ‘Quartz-andesite or dacite’ (quartz-porphyrite), 
etween Greenburn and Wythburn; sp.gr. 2°74. 
(101). 61°15. ‘Trachyte’ (porphyry), Shap Wells Plantation. 
Eight analyses (by F. T. S. Houghton) are given in a paper by 
Prof. Bonney and Mr. Houghton ‘On Some Mica-traps from the 
Kendal and Sedbergh Districts.’§ The silica-percentages are 
cited below in numerical order, (102) to (109). It is to be 
noted that most of these rocks have suffered considerably from 
decomposition. Under (110) to (113) | give some figures from 
four analyses communicated to me by the late Mr. Thos. Tate. 
These, too, are lamprophyre dykes. Nos. (110), (i11) are 
duplicate analyses of a dyke at Helm Gill; (103) is from another 
specimen of the same; and (104) is from ‘Phillips’ dyke’ at 
Ingleton, ‘the best preserved of all the West Yorkshire traps.’ 
(102). 61°12. Mica-lamprophyre, Kendal road, 250 yards from 
third milestone 
(103). 58°34. Mica-lamprophyre, S. of Haygarth, Docker Fell. 
(104). 49°52. Hornblende-lamprophyre, Stile End Farm, 5 miles 
N. of Staveley. 
(105). 48°57. Mica-lamprophyre, railway, W. of Docker Garth. 
(106). 47°88. Mica-lamprophyre, Docker Fell; probably a 
different dyke from No. (103). 
(107). 46°17. Hornblende-lamprophyre, Gill Bank, 114 miles 
N.N.E. of Staveley. 
* Postlethwaite, Quart. Journ. Geol. Soc., vol. xlix., p. $33, 1893. 
+ Binney, Mem. Lit. Phil. Soc. Manch. (3), vol. iv., p. 93, 1871. 
8. 
§ Quart. Journ. Geol. Soc., vol. xxxv., pp. 165-179, 1879. ope reas 
Naturalist, 
