We describe a cryostat which permits growth, and thermal neutron and visual examination of massive single crystals of the rare gas solids, their alloys, and other low melting point materials. Growth is from the melt at pressures up to 4 atm. Solids have been grown on a germanium substrate in an effort to preselect the desired lattice orientation. Temperature control is within a few hundredths of a degree for extended time intervals in a range of temperature from 65 to 230 K.