ISBN: 1231281278

[EAN: 9781231281277], Neubuch, [PU: RareBooksClub], BOOKS GROUP,SUBJECTS, This item is printed on demand. Paperback. 104 pages. Dimensions: 9.7in. x 7.4in. x 0.2in.This historic book may … Plus…

[EAN: 9781231281277], Neubuch, [PU: RareBooksClub], BOOKS GROUP,SUBJECTS, This item is printed on demand. Paperback. 104 pages. Dimensions: 9.7in. x 7.4in. x 0.2in.This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1832 Excerpt: . . . shade. The obscurity wherein the apartments are usually kept has a very pernicious influence on the air: the food of the worms emits in light oxygen, or vital air, while in darkness it exhales carbonic acid gas, unfit for respiration. This well-known fact occurs alike with all leaves similarly circumstanced. To the bad effects thus arising from the exclusion of the suns rays, another evil is added by the nature of the artificial lights employed being such as still further to vitiate the air. An almost incredible quantity of fluid is constantly disengaged by evaporation from the bodies of the insects; and if means be not taken to disperse this as it is produced, another cause of unwholesomeness in the air arises. Noticing this, count Dandolo observes, This series of causes of the deterioration of the air which the worms must inhale may be termed a continued conspiracy against their health and life; and their resisting it, and living through it, shows them to have great strength of constitution. Before this nobleman so zealously undertook the work of reform, the poor silkworms had to struggle through a miserable existence, until, their numbers thinned by death, and their frames weakened by disease, they feebly began to spin that thread which would have been produced superior in quality and much greater in quantity had they been more judiciously tended. By his methodical arrangements, the accidents of seasons and external temperature are no longer formidable. In 1814, a year peculiarly unfavorable for rearing these insects, and which proved extensively fatal in other establishments, he continued his operations with the same unvaried regularity, and, with perhaps increased precautions, was ultimately rewarded by the usual success. In noticin. . . This item ships from La Vergne,TN.<

2012, ISBN: 1231281278

[EAN: 9781231281277], Neubuch, [PU: Rarebooksclub.com, United States], Language: English Brand New Book ***** Print on Demand *****. This historic book may have numerous typos and missing… Plus…

[EAN: 9781231281277], Neubuch, [PU: Rarebooksclub.com, United States], Language: English Brand New Book ***** Print on Demand *****. This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1832 Excerpt: . shade. The obscurity wherein the apartments are usually kept has a very pernicious influence on the air: the food of the worms emits in light oxygen, or vital air, while in darkness it exhales carbonic acid gas, unfit for respiration. This well-known fact occurs alike with all leaves similarly circumstanced. To the bad effects thus arising from the exclusion of the sun s rays, another evil is added by the nature of the artificial lights employed being such as still further to vitiate the air. An almost incredible quantity of fluid is constantly disengaged by evaporation from the bodies of the insects; and if means be not taken to disperse this as it is produced, another cause of unwholesomeness in the air arises. Noticing this, count Dandolo observes, This series of causes of the deterioration of the air which the worms must inhale may be termed a continued conspiracy against their health and life; and their resisting it, and living through it, shows them to have great strength of constitution. Before this nobleman so zealously undertook the work of reform, the poor silkworms had to struggle through a miserable existence, until, their numbers thinned by death, and their frames weakened by disease, they feebly began to spin that thread which would have been produced superior in quality and much greater in quantity had they been more judiciously tended. By his methodical arrangements, the accidents of seasons and external temperature are no longer formidable. In 1814, a year peculiarly unfavorable for rearing these insects, and which proved extensively fatal in other establishments, he continued his operations with the same unvaried regularity, and, with perhaps increased precautions, was ultimately rewarded by the usual success. In noticin.<

ISBN: 9781231281277

Paperback, [PU: Rarebooksclub.com]