. The Bee-keepers' review. Bee culture. THE BEE-KEEPERS' REVIEW 51 ; krost. Fras7s should not take tlie farmer or the horticulturi,-t by surprise. The prol)al)ility of their occurrence can be known with al- most as much certainty as the arrival of an express train. For practical use, one of the most important meteorological instruments is the lit/iironirler, by means of which can be ascertained at any time the deic point, and the approach of low temperature, or of frost, thus foreseen and provided against. If on a fair day. toward evening, the dry l)ulb, which would also be the te
. The Bee-keepers' review. Bee culture. THE BEE-KEEPERS' REVIEW 51 ; krost. Fras7s should not take tlie farmer or the horticulturi,-t by surprise. The prol)al)ility of their occurrence can be known with al- most as much certainty as the arrival of an express train. For practical use, one of the most important meteorological instruments is the lit/iironirler, by means of which can be ascertained at any time the deic point, and the approach of low temperature, or of frost, thus foreseen and provided against. If on a fair day. toward evening, the dry l)ulb, which would also be the temperature of the air, indicated ')0 and the wet bulb HS", the dew point at the time would be about 25", and frost could of course be expected. If, on the other hand, the dry bulb were 50" and the wet bull) 48 , the dew point then would be about 4(i% and no frost need be lea red under the circumstances. The rule and tal)le of factors for computing the dew point is given above. The temperature of the air need not necessarily sink to 32 to produce frost, since plants and other good radiating bodies may ^ecome cooled by radiation con- siderably bplow the temperature of the sur- rounding air, and a heavy frost may occur when a thermometer at some elevation above the surface indicates only ;^<i"to 40". A light frost may occur when the same thermometer indicates as high as 45 . or even 50 , of tem- perature. The formation of frost depends upon the dew point. Dew and frost, like rain and snow, are formed under the same circumstances, excepting the difference in ; ADVERTISEMENTS Money in Cabbage and Celery. " Blood will ; (lood crops cannot be grown with poor strains of seed. For sixteen years Tillinghast's Puget Sound Cabbage, Cauliflower and Celery Seeds have been gaining in popularity. The most extensive growers all over the Union now consider them the best in the world. A catalogue giving full partic- ulars regarding them w
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbeecult, bookyear1888
