GLOSSARY 597 



souffle, soS" fla'. A light, spongy, frothy, baked food. 



snow. Falling water vapor condensed at a temperature below freezing. 



solstice, s6l' stic.. Date upon which the sun seems to turn back north in 



the winter, December 22, or back south in the summer, June 21. 

 specific heat, spe-slf Ik Heat required to raise 1 gram of a substance 



1C. 

 spore, spor. A reproductive cell in higher fungi. A resting cell in 



bacteria, 

 squall cloud, skwal. A low, ragged, tumbling cloud often seen with the 



wind gust in front of a thunderstorm, 

 sterile, ster' II. Free from microorganisms, 

 sterilization, ster" Il-l-za' shon. Act of making sterile, 

 stratus, stra' ttis. A flat layer cloud of rather uniform thickness, 

 strata, stra' ta (sing, stratum). Layers, as of rock in the earth's crust, 

 substratum, sub-stra/ turn. Material through which the hyphse of a 



fungus grow, 

 sucrose, su' kros. One of the sugars, as cane sugar, beet sugar, maple 



sugar. 



susceptible, sus-c6p' ti-ble. Opposite of immune; liability to disease, 

 thermograph, ther' mo-graf . An instrument for writing a continuous 



record of temperature. 



thermostat, ther' mo-stat. A device for automatically regulating tem- 

 perature. 



threshing, thresh' ing. Separating grain or seed from straw or stalks, 

 thunderstorm, thun' der-st6rm. A shower accompanied by thunder and 



lightning, 

 tornado, tSr-na' do. A violent, whirling, twisting wind a few hundred 



yards or less in diameter, usually with a hanging funnel cloud at its 



core. 



toxine, t6ks' In. A poison, often of bacterial origin, 

 treadle, trfid' 1. A lever operated by the foot to run a machine, as a 



sewing machine, 

 tungsten, tung' stn. A steel-gray, heavy, metallic metal, used for 



lamp filaments. 



turbine, tur' bin or tur' bin. One form of water wheel, 

 typhoon, ty-foon'. A violent cyclonic storm occurring over the China 



seas. 



/accinate, vae' ci-nat. To treat with a vaccine. 



vaccine, vac' gin. A substance which induces immunity in an organism, 

 vacuum, vae' yu-um. Space without matter, especially space devoid of 



air. 



vaporize, va' p5r-iz. To change into gaseous form, 

 vernier, ver' ni-er. A sliding scale on a barometer for measuring to very 



small divisions. 



