20 BULLETIN 122, II. S. DEPARTMENT OF AGRICULTURE. 



(12) GLOUCESTER STONY LOAM, SUBSOIL. 



No. 4 sand.- — Minerals other than quartz, 25 per cent. Potash 

 feldspars (orthoclase and microcline), 6 per cent. Muscovite, 10 per 

 cent. Biotite, phlogopite, oligoclase, garnet, labradorite, horn- 

 blende, and piedmontite are also present. 



No. 5 sand.' — Minerals other than quartz, 30 per cent. Potash 

 feldspars (orthoclase), 5 per cent. Muscovite, 8 per cent. Phlogo- 

 pite, hornblende, biotite, epidote, rutile, garnet, tourmaline, labra- 

 dorite, andesite, andalusite, and enstatite are also present. 



Silt.- — Minerals other than quartz, 65 per cent. Potash feldspars 

 (orthoclase), 2 per cent. Muscovite, 35 per cent. Phlogopite, 

 biotite, garnet, hornblende, epidote, rutile, zircon, plagioclases, and 

 augite are also present. 



(13) CARRINGTON LOAM, SOIL. 



No. 4 sand. — Minerals other than quartz, 6 per cent. Potash 

 feldspars (orthoclase and microcline), 5 per cent. No muscovite. 

 Magnetite and rutile inclosed in quartz are also present. 



No. 5 sand.- — Minerals other than quartz, 15 per cent. Potash 

 feldspars (microcline and orthoclase), 10 per cent. No muscovite. 

 Magnetite, hornblende, oligoclase, labradorite, albite, zircon, and 

 corundum are also present. 



Silt.- — Minerals other than quartz, 30 per cent. Potash feldspars 

 (orthoclase and muscovite), 12 per cent. Muscovite, 1 per cent. 

 There are also present magnetite, hornblende, oligoclase, labradorite, 

 rutile, epidote, and an isotropic mineral with an index of refraction 

 below 1.50, making it impossible to accurately determine with avail- 

 able oils. 



(14) FOX FINE SAND, SUBSOIL. 



No. 4 sand.- — Minerals other than quartz, 6 per cent. Potash feld- 

 spars (orthoclase), 4 per cent. No muscovite. Magnetite, apatite in- 

 closedin quartz, labradorite, oligoclase, and hornblende are also present. 



No. 5 sand.- — Minerals other than quartz, 14 per cent. Potash 

 feldspars (orthoclase and microcline), 8 per cent. No muscovite. 

 Magnetite, labradorite, oligoclase, hornblende, rutile, and epidote 

 are also present. 



Silt. — Minerals other than quartz, 2G per cent. Potash feldspars 

 (orthoclase and microcline), 10 per cent. Muscovite negligible. 

 Magnetite, hornblende, epidote, plagioclases, rutile, biotite, and the 

 same indetermined isotropic mineral as noted in No. 13 are also 

 present. 



(15) CECIL CLAY, SOIL. 



No. 4 sand. — Minerals other than quartz, 4 per cent. Potash 

 feldspars (orthoclase), 1.5 per cent. No muscovite. Magnetite, 

 epidote, rutile inclosed in quartz, zircon, and augite are also present. 



